It reflects the long-term energy balance between calorie intake and calorie expenditure. Reducing stored body fat and increasing muscle mass are two different processes. To reduce body fat, you must create a consistent, long-term caloric deficit, so that your body gradually begins to use up its body fat stores for energy.
Aerobic exercise is a good way to increase calorie expenditure.
Aerobic exercise includes activities like running, walking, cycling, rowing, stair climbers, aerobic dance and swimming, among others. Energy expenditure is based on intensity of exercise times your body weight. Fat loss really depends on the long-term balance between energy expenditure and energy intake. Strength training can also help with fat loss. It is thought that increasing muscle mass will cause the body to burn more calories at rest.