You do not need to increase the overall amount of time spent working out, just split a regular training session into two smaller halves. Rather than getting an hour's worth of running in at once, try half before work and half later in the day. If you would rather not go to the gym twice in a day, try doing just one workout at the gym and then a later session outside or at home.Mega Maximus The basics of bodybuilding: Build muscle mass by simultaneously doing fewer reps and lifting more weight.