The Question This Article Answers
Babbitt identifies “closing the door around a hinge” and “rotating the right hip and shoulder around rather than into the left hip” as key coaching observations linked directly to biomechanical data. Kipp’s research confirms that torso rotational velocity during delivery and peak horizontal discus velocity are among the strongest performance variables in elite throwing. But how does a coach actually teach the block and finish? What builds it, what destroys it, and how do we develop it deliberately?
THE BLOCK AND FINISH — A COACHING FRAMEWORK
The block and finish in the discus throw is not a position to be achieved. It is a consequence to be earned.
Everything that happens at the front of the circle is a direct expression of what was organized at the back of it. The quality of the block — and whether the athlete rotates around the left side rather than into it — is determined long before the left foot touches the ground.
Here is how that consequence is built.
Angular momentum generated by the right leg and the right side of the lower body creates rotational movement over the balance point of the right leg. This is not manufactured at the front of the circle. It is the natural output of correct sprint organization — what I call sprint timing — where the right leg functions as the primary rotational driver and the left leg functions as the free leg, moving forward early and efficiently as a direct consequence of that drive.
When sprint timing is correct the left leg touches down early — early relative to the location of the right hip and the rotating right side. This is the critical relationship. The left foot does not arrive late chasing the rotation. It arrives ahead of it, establishing a fixed point before the rotating right side reaches it.
This early touchdown is what makes a true block possible.
When the left leg is in position before the right side arrives, the block becomes a stopping and redirecting mechanism rather than a collision. The linear and angular components of the drive through the middle are preserved — not absorbed, not lost, not disrupted — and redirected into rotational velocity around the blocking left hip.
This is the difference between rotating around the left side and rotating into it.
When the block works correctly the left hip becomes a hinge. The right side of the body — the door — rotates around that hinge with the full momentum of everything that was built from the back of the circle forward. The orbit of the throwing arm and discus expands naturally because the right side has space and time to travel around a stable axis rather than crashing into a moving one.
WHAT THE RESEARCH CONFIRMS
Kipp’s data tells us that effective delivery in elite discus throwers is defined by velocity transfer — not by extending the delivery path. The peak horizontal discus velocity at the end of the delivery phase was the strongest single performance variable in the entire study. Path length alone did not independently predict performance. What mattered was the ability to accelerate the discus effectively during delivery — which is precisely what a correct block makes possible.
When the left side provides a stable axis, the rotational velocity of the torso during delivery increases dramatically. Kipp’s data confirms this — greater torso rotational velocity during the delivery phase was positively associated with throwing distance. That torso velocity is not created during delivery. It is released during delivery. It was built through sprint organization, carried through the transition, and expressed the moment the block gives the system something to rotate around.
Babbitt’s analysis of Alekna’s world record throw confirms the same principle from a different angle. The world record throw was distinguished by a more anteriorly directed center of mass velocity vector at release — meaning the body’s momentum was organized forward toward the throwing sector rather than leaking sideways or rotating away from it.
This is the opposite of what Babbitt identified as twisting out of the finish — the technical fault where the athlete’s momentum exits sideways at release rather than driving through the throw. Twisting out of the finish is almost always a symptom of a failed or late block. When the left side does not establish a stable hinge the right side has nothing to rotate around and the body continues rotating past the throw rather than through it. The momentum that should have been transferred into the discus escapes into the environment instead.
A correct block does not just improve the delivery. It redirects everything that was built from the first movement off the back of the circle into the single most important moment of the throw — the instant the discus leaves the hand.
THE COACHING SUMMARY
The block is not the last thing that happens in a discus throw. It is the moment when everything that happened before it either pays off or falls apart.
Sprint organization creates the angular momentum. Early left leg touchdown preserves the linear drive. The blocking left hip converts both into rotation around a stable axis. The torso fires late and fast through that rotation. The discus reaches peak horizontal velocity at the end of delivery.
And the athlete finishes facing the sector — momentum forward, body organized, the throw completed rather than escaped from.
That is the finish Kipp measured. That is the finish Babbitt described. And that is the finish that can only be taught by building everything that comes before it correctly.
WHAT THIS ALL MEANS — IN PLAIN LANGUAGE
Have you ever tried to crack a bullwhip or snap a towel?
If you have you already understand the block and finish better than you might think. Because making a whip crack is not about strength. It is entirely about timing and sequence.
Before the whip can snap, everything has to be in position. Where are your hands? Where is the whip lying? How much of it is extended and in what direction? When you apply force to the handle, the whip has to be organized and ready to receive that force. Then you move the handle forward — not wildly, not aggressively, but with deliberate timing — and a wave of energy travels the full length of the whip from the handle all the way to the tip. Each section of the whip accelerates as that wave passes through it. The tip — the last and lightest part — receives all of that accumulated energy at once and moves so fast it actually breaks the sound barrier. That crack you hear is a small sonic boom.
Now if any part of that sequence is wrong — if the whip is in the wrong position, if you apply force too early, if your hand position is off, if the timing between the handle movement and the wave of energy is disrupted — the whip does not crack. It just flops. All that potential energy goes nowhere.
The discus throw works exactly the same way. The right leg and right side of the lower body are the handle. The sprint through the middle is the wave of energy traveling through the system. The block — the left hip planting as a stable stopping point — is the moment the energy has nowhere to go except forward and through the implement. And the discus at the end of the throwing arm is the tip of the whip. When everything is sequenced correctly it receives all of that accumulated energy at once and accelerates to peak velocity at exactly the right moment — which is precisely what Kipp’s research identifies as the defining characteristic of elite performance.
When the block fails — when the left side gives way or the left foot arrives too late — the athlete has nothing to rotate around. The body keeps spinning past the throw. The momentum leaks out sideways. The discus gets thrown but the power behind it was never fully delivered. That is what Babbitt called twisting out of the finish. It looks like a release problem. But it is almost always a block problem. And the block problem almost always started much earlier in the throw — in the sprint timing, in the entry, in the very first movement off the back of the circle.
The whip does not crack because of what happens at the tip. It cracks because of everything that happened before the tip.
Fix the beginning and the finish takes care of itself.
This concludes the seven-part series — From the Lab to the Field: A Coach’s Response to Kipp and Babbitt
Dave Wollman · Second Eye Consulting · davidwollman.com · Dallas, Texas
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