Using anything more than 3-5 pounds is useless, in my opinion. The main reason for using dumbells is to improve your shoulder endurance, which means you will be able to keep your gloves up longer when under stress. Naturally if you train with heavier items and then take them away, you will be faster.
Look at Olympic sprinters.
Look at Baseball players.
Look at really any professional athlete.
Hinduw is just to naive to understand the simple concept.
Look at Olympic sprinters.
Look at Baseball players.
Look at really any professional athlete.
Hinduw is just to naive to understand the simple concept.

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