What exercises can i do to shed some pounds? I go to bally's almost everyday now?

ok so ive been goin to the water aerobics cl at bally's and i think im gonna start doin the yoga cl...how does yoga help with losin weight i thought it just help with relaxation. I want to get a flat stomach and lose weight on thighs, arms, back, etc...the water aerobics cl is a great workout i havent gotten on any other machines in the gym besides the treadmill and the....stand up bike thing where u are pedaling kinda lol...but please help also ive been drinkin lots of water...barely eat oh and the soup best life diet thing i guess its ok but anything that helps thanks in advance!