SECOND EYE CONSULTING · DAVE WOLLMAN · DALLAS, TEXAS
FROM THE LAB TO THE FIELD · ARTICLE 4 OF 6
Orbit: What Creates the Longest and Earliest Sling
The Question This Article Answers
Babbitt’s data confirms that Alekna’s world record throw produced the longest orbital path in the series — 4.01 meters through the delivery phase, compared to 3.83 meters in the rushed first throw. Kipp’s broader research confirms that orbital path length during delivery is associated with performance. But what actually creates a longer orbit? And more specifically — what creates the longest and earliest sling, and therefore the longest orbital path?
WHAT THE ORBIT ACTUALLY IS
The orbital path of the discus is not something the athlete creates by extending the arm or consciously reaching for distance. It is the natural consequence of a physical relationship between the rotating axis of the thrower and the moment arm — the discus — attached to it.
As the thrower’s axis rotates with increasing velocity, physics takes over. An object attached to a rotating axis by a moment arm experiences centrifugal force — a force pulling it outward and away from the center of rotation. The faster the rotation, the greater the outward force, and the farther the implement moves from the axis. The discus does not need to be pushed into a wider orbit. It is pulled into one by the rotational acceleration of the system it is connected to.
This means the orbit is not created in the delivery phase. The delivery phase is where the orbit is expressed and measured. The orbit was already long or short before the delivery began — determined entirely by how early and how continuously the right hip separated from the discus and began accelerating away from it around the central axis.
The orbit begins the moment the right hip moves away from the discus. Everything that happens before that moment either builds the sling or delays it.
THE SLING — AND WHAT MAKES IT LONGEST
A sling is one of the oldest mechanical tools in human history. An object is attached to a cord or arm, rotated around a central point, and accelerated through that rotation until release. The physics are straightforward: the longer the object remains in the sling relationship — connected to the rotating system, being pulled outward by increasing velocity — the more velocity it accumulates before release.
In the discus throw, the thrower’s body is the sling. The right hip is the leading edge of the rotating system. The throwing arm and discus are the cord and projectile. And the sling relationship begins the moment the right hip separates from the discus and begins its accelerating rotation around the central axis.
The question for this article is not whether the sling exists. Every discus thrower who has ever thrown a competitive distance has created a sling relationship of some kind. The question is when that sling begins — because the earlier it begins, the longer the discus spends being accelerated outward, and the longer the orbital path becomes.
What creates the longest and earliest sling? That is the question. And the answer is not what most coaches are currently teaching.
THE CONVENTIONAL TEACHING — AND ITS LIMITATION
Across coaching literature, videos, and clinics, a consistent framework for the back of the circle has emerged and been widely repeated. The left side is deliberately slowed or restrained so that the right leg can swing wide, get ahead of the left side, and establish its rotational arc before the sprint initiates. The right leg leads. The left side follows. The sprint comes after the right leg has completed or nearly completed its sweep.
This framework has produced excellent throwers. It is not wrong in the sense that it fails to produce results. Athletes trained in this system have thrown world-class distances for decades.
But there is a mechanical limitation built into this sequence that is rarely examined: if the right leg must swing wide and get ahead before the sprint fires, then the sling relationship — the moment the right hip begins acting on the discus — cannot begin until the right leg has completed a significant portion of its arc. The sprint comes late because it is waiting for the right leg. And because the sprint comes late, the left leg’s linear drive catches the right hip late. And because the right hip is caught late, the separation between the right hip and the discus begins late. And a late-beginning sling is a shorter sling.
The conventional teaching produces a sling. It does not produce the earliest or longest sling possible.
A DIFFERENT QUESTION ENTIRELY
When I began developing the early sprint approach to the back of the circle, I was not trying to solve the same problem the conventional teaching was solving. I was not thinking about how to control the left side so the right leg could swing more effectively.
I was thinking about something completely different: how do I get the right hip to begin acting on the discus as early as possible — not when the throw is already moving toward the front, but while it is still moving through the back of the circle?
Many coaches were already teaching athletes to keep the discus back as the right leg moved through its circular path. That part was understood. What was not being addressed was the question of when the hip actually began acting on the discus — when the separation between the right hip and the discus became an accelerating, force-producing relationship rather than simply a maintained position.
I wanted that moment to happen sooner. Not by moving the discus differently, but by getting the hip to move away from it earlier — while the throw was still in the back, before it arrived at the middle. The goal was to have the discus traveling in the sling relationship for more of the throw, so that by the time the athlete reached the delivery phase, the orbital path was already long.
The idea was simple: act on the discus sooner. Separate the hip from the discus earlier. Create the sling in the back of the circle, not in the delivery.
ON IT, OFF IT
The teaching cue that captured this concept most precisely was one I found myself using with athlete after athlete: on it, off it.
The moment you feel the weight come down onto the left leg — use it. Don’t hold it. Don’t wait for the right leg to finish its arc. The instant the weight transfers onto the left, convert it to linear movement and drive off it. Catch the right leg still moving around the back. Separate the right hip from the discus at that earlier moment. Start the sling while the throw is still in the back of the circle.
On it, off it. As quickly as possible. As soon as the weight is there, it is already leaving.
The center of mass dropped slightly sooner as the left side opened — not as a stylistic choice, but as the mechanical prerequisite for that rapid weight transfer. You cannot sprint off a leg you are not yet on. The earlier drop onto the left set up the sprint. The sprint caught the right hip. The right hip separated from the discus. The sling began earlier than the conventional teaching allowed.
On it, off it. Four words that contain the entire mechanical principle of what makes the earliest sling possible.
WHAT THE LEFT LEG ACTUALLY DOES
To understand why this works, it is necessary to understand what the left leg is doing in this approach — and how it differs from the conventional teaching.
In the conventional framework, the left side slows its rotation. It is still rotating — just controlled, kept from turning too fast. The rotation of the left side is managed to serve the right leg’s arc. The left remains in a rotational mode throughout, simply at a reduced tempo.
In the approach I teach — and in what the technical analysis of Alekna’s world record throw confirms — something fundamentally different happens. The left side does not merely slow its rotation. It stops rotating and converts to linear movement. It transitions from rotational mode to sprint mode earlier than the conventional teaching would allow.
That conversion — from rotational to linear — is the key event. When the left leg converts to linear and begins its sprint drive, it does not wait for the right leg to finish its arc. It fires while the right leg is still moving through the back. And the linear drive of the left leg catches the right hip — pulls it forward, away from the discus — at an earlier moment in the throw than the right-leg-first sequence produces.
The right hip separates from the discus earlier because the left leg sprint fires earlier. Earlier separation means an earlier sling. An earlier sling means a longer orbital path.
THE WORLD RECORD DATA
The technical analysis of Alekna’s 74.35m world record throw confirms this sequence directly. The analysis describes the left pivot as not yet completed when the right knee begins driving across the circle. The left fires before the right finishes.
This is the opposite of the conventional teaching. In the conventional sequence, the right finishes before the left fires. In Alekna’s world record throw, the left fires before the right finishes. The left converts to linear while the right is still moving through its arc.
The consequence in the data is exactly what the physics predicts. The delivery phase orbital path was 4.01 meters for the world record throw. The rushed first throw, which showed disrupted sequencing throughout, produced only 3.83 meters — 4.5 percent shorter. A sling that began later produced a measurably shorter orbit, in the same athlete, on the same day, against the same conditions.
The data Babbitt collected is not just a measurement of Alekna’s orbit. It is evidence of what the earliest possible sling produces when it is executed correctly from the back of the circle.
TWO ATHLETES, TWO BODIES, ONE PRINCIPLE
The on-it-off-it principle does not apply identically to every body. Two athletes I worked with in the lead-up to the 2004 Athens Olympics demonstrated this as clearly as any coaching experience I have had.
Aleksander Tammert of Estonia, who won the bronze medal in Athens, was one of the first athletes I worked with on the early sprint concept. In a wide stance, the on-it-off-it sprint — combined with the early left leg conversion to linear — placed enormous stress on his groin. The position that Alekna handles with apparent ease — moving across the left side as the sprint initiates — caused Tammert significant and persistent groin pain. We had to narrow his base to maintain the sprint timing and the early hip separation without the injury. The narrower base allowed the same on-it-off-it sequence to fire at the same moment, but without placing the groin in the wide, loaded position that was causing the problem. What Alekna’s ability to handle that position tells us, from a coaching perspective, is something specific: his tendon and ligament strength in that extreme groin position is exceptional. It is not a technique that every thrower can replicate in its widest expression, and coaches working with this concept need to account for the individual physical demands it places on the body.
Hannes Hopley of South Africa finished eighth in the same Olympic Games — and for nineteen years held the collegiate record in the discus throw, until Mykolas Alekna broke it. Hopley presented the opposite challenge from Tammert. His short levers meant the entire sequence — Wind Connect, drop, sprint — happened so fast it was almost invisible. There was barely time to see it before it was over. The on-it-off-it sprint in Hopley was not a deliberate, observable pause and drive. It was explosive, immediate, and nearly percussive. What I always felt watching Hopley throw at his best was the image of separating an old 1960s car spring — when you build that level of torque in a coiled spring and it snaps back, the release is not a gradual increase in force. It is an instantaneous, total transfer of stored energy. That was Hopley. Short levers, extraordinary core, dynamic beyond what most throwers can access, and a sprint off the left that turned the early hip separation into something closer to an explosion than a technique.
Same principle. Two completely different physical expressions. One required a narrower base to protect the groin. The other happened so fast it looked like a single movement. The principle does not change. The body it works through determines how it looks.
THE BONUS NOBODY EXPECTED
When I began teaching on it, off it — when I began coaching athletes to convert the left side to linear before the right leg completed its arc — the goal was singular: earlier hip-to-discus separation. A longer sling. A wider orbit. More throw distance as a direct consequence of acting on the discus sooner.
What I did not expect was what happened to the middle of the circle.
The coaching language that the entire field was using at the time — and that much of the field is still using today — became unnecessary. Keep turning your right foot. Don’t overstep the middle. Land behind the midline. Leave room to work with. All of it. Gone. Not because those instructions were wrong, but because when the on-it-off-it sprint fired correctly and caught the right leg early, the right foot found the center of mass on its own, every time. The brain’s existing sprint program — the neurological system that has been placing the free leg under the center of mass since the athlete first learned to walk — simply took over. There was nothing to coach.
I had not seen the neuromuscular connection coming. I was not thinking about right foot placement when I developed the early sprint. I was thinking about acting on the discus sooner. The right foot solving itself was a consequence of the sprint mechanic engaging, not a goal I had set out to achieve.
Babbitt, writing in 2026, still identifies “leaving room to work with” as a key coaching observation — because coaches are still trying to teach it as an instruction. They are still telling athletes where to land the right foot. The early sprint eliminated the need for that instruction decades ago, in the athletes I coached, because it gave the brain the information it needed to solve the problem automatically.
I was trying to start the sling sooner. The right foot finding center mass on its own was the bonus I did not know was coming.
AN HONEST NOTE ON WHAT WE CAN AND CANNOT COMPARE
This article would be stronger if we could present side-by-side orbital path measurements comparing world record throws across different eras and different techniques. We cannot. The markerless motion capture technology that allowed Babbitt and Kipp to measure Alekna’s orbital path to within centimeters did not exist in 1976. The throws of that era were extraordinary achievements by extraordinary athletes. But the kinematic data to compare orbital paths across half a century simply does not exist.
What we have instead is physics and coaching observation across four decades and hundreds of athletes. The physics are unambiguous: a sling that begins earlier produces a longer accelerating path. The coaching observation is consistent: the on-it-off-it sprint — the early conversion of the left side from rotational to linear — produces longer throws and better orbital paths than the right-leg-first sequence produces in the same athletes.
The Babbitt data gives us the measurement for one throw — the best throw in a world record series, produced by an athlete whose technique reflects exactly the early sprint principles this article describes. That measurement is 4.01 meters of orbital path during the delivery phase. It is the most precisely measured orbital path of any world record throw in the history of the event.
We cannot compare that number to what came before. But we can understand why it is as large as it is. And we can teach the principle that produced it.
WHAT THIS MEANS FOR COACHING
The practical implication of everything in this article connects directly back to Articles 2 and 3 of this series.
The Wind Connect, established in Article 2, creates the first moment of hip-to-discus separation at the back of the circle. When the lower body leads through the wind and the upper body stays connected but behind, the right hip begins its earliest possible separation from the discus while the throw is still in the entry phase. That is the beginning of the sling — not in the delivery, not in the middle, but in the back.
The on-it-off-it sprint, introduced in Article 3, then fires before the right leg completes its arc. The linear drive of the left leg catches the right hip and accelerates the separation that the Wind Connect began. The sling is now building through the back of the circle, not waiting to begin at the middle.
By the time the athlete arrives at the power position, the sling relationship has already been active for a significant portion of the throw. The discus has been traveling outward under centrifugal force from an earlier point in the movement. The orbital path that Babbitt measures in the delivery phase is not created in the delivery phase. It is the accumulated result of a sling that was started in the back and maintained through the middle.
The orbit is not a delivery phase event. It is the cumulative product of a sling that begins in the back of the circle — earlier than most coaches currently teach, and for a reason that was never about clearing the left side. It was always about acting on the discus sooner.
A FINAL THOUGHT ON THE SLING
The word “sling” has been used in discus coaching for a long time. It describes a real mechanical phenomenon — the relationship between a rotating system and the implement connected to it. Every coach who has used the word understands something true about the event.
But understanding that the sling exists is different from understanding what maximizes it. The sling is maximized not by swinging the right leg wider or waiting longer for the right leg to get ahead. It is maximized by starting it sooner.
The earliest possible sling begins when the right hip first moves away from the discus under the influence of a linear drive that fires before the rotational arc is complete. That is what Alekna’s world record throw shows in the data. That is what Aleksander Tammert demonstrated — even through the physical demands it placed on his body. That is what Hannes Hopley showed in a version so explosive it barely looked like a technique at all.
And it is what the on-it-off-it cue was designed to create: the moment the weight arrives on the left, use it. Drive off it. Catch the right hip still moving around the back. Separate the hip from the discus at that earlier moment. Start the sling in the back of the circle.
Act on the discus sooner. The orbit will take care of itself.
Each article in this series will be accompanied by video demonstrations covering the key concepts, drills, and terminology discussed. Follow along on Instagram and at davidwollman.com as those videos become available.
Next: Article 5 — The Hip-Shoulder Relationship: How Separation Creates Power
Dave Wollman · Second Eye Consulting · davidwollman.com · Dallas, Texas
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