How To Build Up Muscle

Muscle Building?

hi.
i am 13, 93 pounds, and 5'3.
i want to gain some weight in my legs.
but if i work out [the muscle gaining way]
i just lose weight. and fast!
if you do muscle flexing reps will you get bigger muscles that way.
because my legs are way too small for my age.
please help.
thanx!
:]]]

just do a lot of squats, leg extentions, and other exercises with 85 percent of your max

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