Now what about type two B? Well, type two B muscles are basically those muscles that appear white and that's because they contain a relatively low concentration of myoglobin. Now they break down ATP quickly but at the same time they actually fatigue very quickly and they contain a very high concentration of glycogen, our glucose stored inside our muscles. So type one skeleton muscles we usually find inside the postural muscles, they give us aroposture. Type two A are those muscles that are usually found within our legs and type two B are those muscles that are usually found within our arms and upper arms. So basically these are the three different types of skeletal muscle that we can find inside our body.