A true test of someone's strength can be determined by seeing how many 'pull ups' he can do.A pull up is an exercise you do by hanging from a bar and then pulling your body up using just your arms.——Monroe Mann
  如何做引體向上
  如果想要真正測試某人的力量,可以通過他能做多少個引體向上來判定。引體向上是一種運動,雙手牽引把自己懸掛在單杠上,然後將自己的身體向上提升,而且只能借助手臂的力量。  (原標題:How to Do Pull-ups)
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