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Why do your throwers throw further in warm-ups than in the circle?

The usual explanation is nerves, but the mechanism is almost always the same thing: the legs stop leading and the arm starts leading.

It is one of the most common complaints from a throws coach: the best mark of the day happens during warm-ups, with nobody watching and no marker in the ground, and the competition throws never catch up to it. "Nerves" is the usual answer, and it is not wrong, but it is not specific enough to fix anything.

What nerves actually do to a throw

A good throw is sequenced: the legs and hips start the movement, the trunk follows, and the arm finishes last, adding speed to something already moving. Under competition pressure, that order is the first thing to break. The athlete rushes the drive leg to get the throw over with, the hips arrive late or not at all, and the arm ends up doing work the legs were supposed to do. The result is a throw that feels just as hard, sometimes harder, and travels a shorter distance, because arm speed alone is a small fraction of what the full sequence produces.

What to look for

• Does the first move in the circle look faster or more rushed in competition than in warm-ups?
• Does the trunk lean forward over the drive leg earlier than it does in a good warm-up throw?
• Does the release look lower or flatter under pressure, which usually means the hips never got there?

Where the Film Room fits, and where it is honest about its limits

The throws setting reports a release angle read from the hand's fastest point of travel, and it grades that one against a real band. It also reports whether the trunk stays tall over the drive leg and whether the throwing arm stays long until the block, but it shows those two as numbers rather than verdicts, on purpose: an unsigned trunk-lean reading cannot tell a collapsed forward lean from a correctly tall one without knowing which way the athlete is facing, and one elbow-angle band cannot be right for a shot putter's folded arm and a discus thrower's long one at the same time. Film a warm-up throw and a competition throw from the same spot and compare all three numbers side by side. A rushed competition throw usually shows a lower release angle even when the athlete swears it felt the same.

A single 2D camera cannot see grip, footing inside the circle, wind, or whether a throw was legal. It also cannot measure nerves directly. What it can do is put a number on the one thing nerves reliably change, the sequence, so a coach is arguing with a measurement instead of a feeling.

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