Now our type one skeletal muscle also contains a very high concentration of mitochondria and when it breaks down ATP type one skeletal muscle breaks down ATP very slowly and as a result these are known as slow twitch muscles because they break down ATP slowly and that means these have a very low velocity of contraction. The contraction of type one muscles takes place relatively slowly and because of this they are actually slow to fatigue and contract slowly as mentioned earlier. Now where exactly in our body would we normally find type one skeleton muscle? So these are basically our postural skeletal muscles. Our skeletal muscles found in the back that basically give us our posture that allow us to actually stand and walk around without bending over or anything like that. And that's exactly why they essentially are slow to fatigue.