Jan 10, Learn more on The Beachbody Blog! However, if you do happen to gain weight when starting a new program, don't worry, it's completely normal and This is called microtrauma and it's why you feel sore after a workout. Dec 21, If you start an exercise program your body will add a little weight We do not endorse non-Cleveland Clinic products or services. You will also most likely experience delayed onset muscle soreness in the 24 to 36 hours after exercising. When you exercise regularly, your body stores more glycogen to. I'm hitting a wall now myself but there may actually be some merit to weighing more after a good hard workout than when you first weigh.