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I need to make sure my pronation and supination and range of motion is all on point so I’m not unnecessarily stressing something up the chain.’

To throw the changeup, he needed his wrist to snap in the other direction, a process called pronation.

But after several years of lab research, Caprara concluded that pronation is only one of several important aspects to a person’s stride — and shouldn’t always be controlled.

His signature pitch is thrown with a circle-change grip, but the pronation of his wrist as he releases the ball creates both left-to-right and downward movement.

The majority of people have what is called overpronation, where the foot rolls inwards during the stride, but some people under pronate where the opposite is true, while others have neutral pronation.