他绷紧肌肉准备跳跃。
系统地绷紧肌肉群直到感觉疼痛—大约20秒—然后慢慢放松。
Systematically tense each muscle group in turn until it starts to hurt - about 20 seconds - and then let go.
我的意思是，他会绷紧肌肉站在那，借此使得自己身体以最佳效果呈现。
What I mean is he'll stand with all his muscles pulled tight, to show his body off to best advantage.
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