I start my weight loss tonight. I will go for a run, and then do 50 sit ups. I havent really run for a while, so i don't know how far to run, and how long for. I will probably run for 45 minutes - 1 hour, then followed by sit ups. I really want to reduce my curves, and drop a jean size, and also tone up my tummy, to get the flat stomach im aiming for! any suggestions?