Hi Alex - It's not a good idea for a boy of your age to lift weights. The reason for this is that your bones are growing rapidly during puberty, and lifting weights can prevent the bones from growing correctly. It is advisable to wait until at least 16 before weight training. I believe it is OK to use your own body to train - e.g. press ups, sit-ups etc. Just give the weights a miss for a couple of years. Regards, John.
Wow, that answer is dead wrong. NUMEROUS studies have shown that lifting weights at ages under 16 is not at all harmful and will not prevent your bones from growing correctly. Certainly anyone that age should be under adult supervision when lifting (especially free weights).
Please don't keep spreading the myth about weight training and kids.
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