im 14 years old a bit under 6ft tall im thin and i want to know if wieght training,running,stretching,eating alot will improve my muscle mass and posture i have these 8 pound dumb bells 4 pound wieght straps that go with my legs. Im asking people out there how to exorcise properly with these tools because the last time i tried to exorcise i apperantly did it wrong and it gave me chest,abdomen and lower back pains. i cant ask a gym teacher because i doubt ill have phys ed classes the first term so can someone tell me what kind of diet i need and what kind of movements and what kind of warm-ups i can try?
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