Punching with one of those stretch band things is better, because the resistance is against your fist/hand, not weighing DOWN your arm.
You hold one end behind your back, it loops up over your shoulder, along your arm and then into your punching hand. And you throw punches to full extension with it. This develops the actual punching muscles, and not the muscles which keep your arm in the air.
You hold one end behind your back, it loops up over your shoulder, along your arm and then into your punching hand. And you throw punches to full extension with it. This develops the actual punching muscles, and not the muscles which keep your arm in the air.
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