We exert a very low force over a very long distance so that our muscles don't fatigue very quickly. So these are the muscles that are used in that case. What about our type two A muscles known as fast oxidative or fast twitch muscles? So fast simply means the breakdown of ATP is quick. So we break down ATP very quickly and that means the muscle contraction is high. Now, just like slow oxidative, fast oxidative also uses aerobic respiration and that means it also contains a high supply of oxygen.