At age 15 , 155lbs is good. Think about if you were to put on 10lbs of lean muscle a yr then you would be over 200lbs at 20 and at 5'10 that's good.

Yes, it's possible to put on muscle while maintaining low fat - but you have to do it slow. Take your time and don't rush anything. Hit the gym hard and stay on a good diet with higher calories.

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