Welty said her son never met a tree he didn't want to climb and was so strong he could do pull-ups with two fingers.

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Every few days, Vinh Cao would do sets of pull-ups, sometimes using the glove for three minutes between sets, to test its effects.

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To avoid being discharged, he would have to run three miles in less than 33 minutes, do 100 sit-ups in two minutes and manage three pull-ups.

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