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Amazon.com : Grip Strength Trainer 1 Pack, Hand Grip Exerciser Strengthener with Adjustable Resistance 11-132 Lbs (5-60kg), Forearm Strengthener, Hand Exerciser for Muscle Building and Injury Recover : Sports & Outdoors
With what force must a man pull on a rope to hold a plank in position if the man weights 60 kg, neglecting the weight of the plank, rope and pulley? - Quora
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