How can you build your body? How to develop abs? Broaden your chest? Jump higher

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help.. i need my body to be fit. be athletic enough to be a player. i have the skills in basketball. stealer , 3 point shooter. but i lack the body. my body is not big. i'm 5'5 in height. 1st is., i need to work on my abs.. how do i develop it? and broaden the chest. jumping higher.. i need you help..