How can I build strong muscular looking arms before high school sports/life?

Leggy

New member
I'm a 14 yr old guy that is 97 pounds!!! I'm going into my freshman yr in high school next yr and I signed up for cross country and la crosse. I need a solution to get stronger upper body strength while looking more muscular and less skinny and small. I REALLY need advise as to how to work out right, what to eat and not to eat, and who i should go to for help!
 
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