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How far apart should you set the blocks?

Bunch, medium and elongated block settings are not a matter of taste, they trade power against time, and most blocks on a track are set the way they have always been set.

Most sprinters set their blocks the way they were shown on day one and never touch them again. That is not laziness. Block spacing is one of the least-taught parts of the start, and almost nobody re-measures it once an athlete has a setting that feels normal.

What the spacing actually trades

The distance between the two pedals decides how long the front leg has to straighten before it is fully extended, and how much power the rear leg can still add once it is. Pedals set close together, a bunch start, put both feet near the line and the hips high. The front leg is already close to straight at the gun, so there is very little time to generate force before the athlete is out of the blocks. Spread the pedals further apart, an elongated start, and the front leg has more distance to straighten through, which gives the rear leg more time to drive, at the cost of a longer, slower first push off the line.

Who each setting actually suits

• A bunch start rewards an athlete who is already explosive off very little setup, but it punishes anyone who needs time to apply force, which is most developing sprinters.
• An elongated start suits a taller athlete with longer levers, who needs the extra distance to get the rear leg fully involved before the first step.
• The medium setting, somewhere between the two, is the default for a reason: it is the one setting that rarely produces an obvious fault in either direction, which is why most coaches never leave it.

None of this shows up on the first step. It shows up two or three steps later, as either a stand-up out of the blocks because there was nowhere left to push, or a first step that goes nowhere because the athlete was still unwinding a stretch they were not ready for.

Where the Film Room fits

The block start setting in the Film Room reads the first six steps: drive-phase trunk lean and whether the athlete stands up early, whether the hips climb instead of driving out, and back-leg extension at clearance. It does not know how the blocks were set. What it shows you is the consequence of the setting, not the setting itself. Change the spacing, film the same six steps, and compare the trunk lean and the stand-up point against the last setting. If the number moves, the change did something. If the athlete still pops up at step three, the blocks were not the problem.

A single side-on camera cannot see where the pedals are set, how the feet are placed in them, or whether the push is even between the two legs. Those still get read with a tape measure and a coach standing behind the blocks, not with a phone at the finish.

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