Our expert says:
12 is young for someone to be doing weight-training, and it can have detrimental effects on a developing body if over-done. I strongly suggest you get advice from staff at the gym where you go. They should have personal trainers on hand who will advise on the best kinds of exercise. In many gyms they have a rule that under 16's should not be using weight-training equipment, so check before you go any further.
For his age one of the best forms of exercise is swimming.
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