Stiff-legged running, body moves up-and-down excessively (remember, the goal of running is to move forward, not up and down)

Stiff-legged running, body moves up-and-down excessively (remember, the goal of running is to move forward, not up and down)

Stiff-legged running, body moves up-and-down excessively (remember, the goal of running is to move forward, not up and down)

Stiff-legged running, body moves up-and-down excessively (remember, the goal of running is to move forward, not up and down)

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