Does holding a 20 lb dumbbell while punching increase punch speed/strength? If not what does it do? - Quora
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Metal Boxing Hand Weights, Nonslip Grip Training Equipment, Body Building Trainer, Muscle Dumbbell for Home Gym, Fitness Exercise, Cardio, Walking 1.6kg Black - Walmart.com
Does boxing let you gain more muscle mass or would you have to go to a gym separately for getting stronger? - Quora
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