Is Exercise Necessary for Weight Gain

You don't have to work out to gain weight. Gaining weight takes eating more calories and nutrients each day than you use, whether through exercise or your normal daily routine. Working out can help with weight gain by increasing muscle mass because muscle is heavier than body fat. So, if you are maintaining a weight that is not optimal, you need to increase calories. If you are working out, you will need to increase your caloric intake exponentially to make up for the calories you are burning with exercise.