At your age your size is greatly determined by your genetics. If you want to increase overall mass the only way to do so is by upping your caloric intake. If you do alot of running and cardio type exercises you need to take in alot more than you are burning. Getting some High Calorie protien shakes with high protien levels would be best. I drink 2 shakes a day normally for a total of at a very minimum 3500 total calories. Your diet determines your size is what it boils down to. Eat lots of protien and carbs.
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The More You Sweat In The Gym, The Less You Bleed In The Ring.
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