The muscles in your bum are the largest in your body.If your thoughts about your rear have never extended beyond does my bum look big in this? you might be surprised to learn that its the key to whole-body firmness.Is your strength training not having the desired effect? It could be that your glutes are not working fully meaning other muscles have to pick up the slack. When the glutes start to weaken compensation occurs. The hamstrings and lower back muscles are recruited ins