Home Uncategorized The body works to build muscle and recover 24 hours a day, not just during that one-hour session at the gym. Luckily, smartly timed snacks can give the body the fuel it needs to gain muscle, burn fat, and recover as best it can. Pre-workout, that usually means grabbing a snack about 30-60 minutes in advance, depending on its size and contents, and how much that stomachs actually grumbling.