I was quite into it when i was your age around 16-18 but i had a bit of an accident when weight lifting and had abit of a weird blackout which quite honestly scared me a hell of a lot.
I'm still big but i've toned up more with more cardio and with quicker and lighter reps than slower, heavier ones.
Also watch your back man, i remember sometimes coming up to fast with a squat or coming off the bench doing some weight exercises and damaging my back quite badly and nothing hurts more than a bad back imo.
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