Will I Build Muscle If I Use A Punching Bag FeaturesPunching bags come in two basic types -- a heavy bag and speed bag. A speed bag is small, light and at eye level. As the name implies, it is used to develop speed and quickness. A heavy bag is large and heavy, and used in a slower fashion. Its main function is to develop punching power. When you punch this bag, you forcefully contract a high amount of muscle fibers. This will not make you bigger, but it will help improve your definition, especially because you burn calories while you work out. A 180 lb. The pectorals, deltoids, triceps, latissimus dorsi, glutes, quadriceps and hamstrings are examples. The pecs are the chest muscles, the delts are on the sides of the shoulders, the triceps are on the back of the arms and the lats are in the back. The quads, hamstrings and glutes are in the legs and butt. The abs also contract to generate force and to keep your body balanced. It should not be used as a substitute for professional medical advice, diagnosis or treatment. LIVESTRONG is a registered trademark of the LIVESTRONG Foundation. Moreover, we do not select every advertiser or advertisement that appears on the web site-many of the advertisements are served by third party advertising companies.