小伙子跑得不错，已经从起跑冲刺进入途中匀速跑。他像一匹马驹昂头急奔：步幅匀称，步频紧凑，蹬动有力，腰肢放松——整个动作显得优美而富有弹性

The boy runs well, already began sprinting into uniform runs way from. He is like a pony head: a stride frequency symmetry, compact, pedal, powerful, waist relaxed -- the whole action is beautiful and full of elasticity