BMR = 655 + (9.6 x weight in kg) + (1.8 x height in cm) - (4.7 x age in Yrs) To work out your total daily calorie needs, multiply your BMR by the appropriate activity below: If you are sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.1. If you are lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation. Use Slow Aerobic Cardio. With fat loss comes cardio training. Yet the kind of cardio you do can maintain all your hard-earned muscle or destroy it. Use slow and easy methods of aerobic exercise such as walking on a treadmill at an incline, an easy bike ride, or a light jog. Maintaining an easy pace will only use your Type I muscle fibers, which.