When you exercise (including doing strength training) you will add muscle mass, which weighs more than fat.
You also need to pay attention to how often and how much you are eating. You should be eating every 2-3 hours and not skipping any meals. Also, adding in some protein shakes before or after meals or workouts might be healthy way to increase your calorie intake and gain additional weight.
By using the No Excuses Workout System to do personalized interval workouts and to do our highly-effective No Excuses Workout (in-home strength training requiring no equipment), you will maximize your exercise results, stay motivated and increase your percentage of muscle mass. By adding muscle mass, you will decrease your body fat percentage (which is really important and great for your health) and should gain weight.
We would love to have you as one of our valued members and are confident you will be very impressed with the efficiency and effectiveness of your personalized interval workouts.