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Anonymous
I doubt he will be able to do HIIT at all, or at least correctly. And if he does, screwing up the cartilage in his knees to the point where he will have knee problems for the rest of his life is not worth losing some weight.
I went from 200 lb to 140 lb when I was 14, and I did so from making a calorie deficit and first walking for 45 minutes, and eventually increased my speed to the point where I was simply jogging five to six mph. I did this everyday, but you can probably just do it five days a week. The hardest part will be the eating, though. May sure the deficit you put him on isn't too low, since he's young and needs the calories, and make sure he's getting enough protein. I wouldn't suggest lifting for him yet, except body weight exercises like pull ups or something. Though, at his current weight, I doubt he'll be able to do even one.
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