Most people that workout think that lifting higher weight with less reps does more with helping build muscle. But in actuality, lifting light weights with high repetition does the same thing. Sure big weights looks more cool but less weight helps bring down the stress on the muscles that you are trying to workout. Lifting heavy weights helps releases more muscle-growth and fat-burning hormones than lifting light weights. Lifting heavy weights burns more body fat than lifting light weights, and the heavier the weight, the more calories you burn with each rep. Because they recruit fast-twitch fibers, heavy weights also burn more fat after your workout. Fast-twitch fibers tap into fat stores in your body for energy, since it’s available more quickly than oxygen. By lifting heavier weights for a fewer reps, which calls for a shorter workout, actually builds more muscle than a longer workout using lighter weights. The more muscle mass you have, the faster your metabolism.