What exercise to do for reducing tummy? and also buttocks and thighs?

Sit-ups Leg-lifts...: You can't target weight loss from a specific area, but losing weight in general will help. You need to burn more calories than you consume. Watch your diet - eat healthily, cut out junk food, and exercise several times a week. If your stomach is what you're unhappy with, you can tone up the muscles - sit ups are a good way to start. Anything that uses the abdominal muscles will add tone.