Doing strength training to build muscle. This helps build muscle mass, and muscle tissue burns more calories -- even when you're at rest -- than body fat.
Doing aerobic exercise.
Drinking caffeine. Caffeine is a stimulant, and stimulants tend to increase the calories you burn. It gives the body the impression that it has more energy, which means you would be moving more.
Drinking water. Drinking water can help burn more calories. Drinking cold water burns more calories because your body is going to warm up and make it the same temperature as your body.