And that means the pathway of ATP production is aerobic. So they use not only glycolysis, but they also use the CReP cycle and the electron transport chain to actually produce our ATP. Now, because they have a lot of oxygen, that means they have a high concentration of myoglobin because myoglobin is the protein carrier that actually carries that oxygen in our muscle tissue. So that means we have a high amount of myoglobin and these muscles appear red. And that's exactly why these are also known as red muscles. Now, how exactly does oxygen actually get to our slow oxidative muscle?