Hi Deergha,
Doing lots of cardio exercises like running, jogging, brisk walking, skipping, swimming, etc. help to reduce your body fat percentage while weight training exercises like lunges, squats, crunches, reverse crunches, etc would help to tone your body muscles and give your body more firmer look. Also, only exercises wont work much if you dosent keep a control on your diet. Control in a diet means that you need to have a healthy food and avoid any junk food in your daily routine. So, you need to have a combination of diet an exercises for weight loss.