It is not recommend for a 12-year-olds to perform Weightlifting, because it will not increase/enlarge their muscle. It MAY gain some strength, but not very significant. He/she should wait until he/she becomes 16. ..... It is all depends on that 12-year-old's strength and mostly on willpower. That child should start at 1 lbs and then progress 2, 3, 4 to 5 lbs or more.
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The average 12 year old is able to bench 50-75 pounds.
at least 20
Well im 12 and i can bench 120lbs. about 10 times and i weigh 135 lbs.
you don't bench considering your age you bench on how much you weigh and your top weight you can handle.