Based on the information available, Lipitor's role in endurance is primarily associated with its function in controlling cholesterol levels. Lipitor, a brand name for the drug atorvastatin, is a type of statin that lowers cholesterol levels in the blood by reducing the production of cholesterol in the body and increasing the removal of low-density lipoprotein (LDL), or "bad" cholesterol, from the blood [1].

High cholesterol is a major risk factor for heart disease, which is the leading cause of death in the United States [1]. By controlling cholesterol levels, Lipitor helps to reduce the risk of heart disease and stroke [1].

While Lipitor's primary role is in cholesterol control, there is some evidence to suggest that statins like Lipitor may have other benefits, such as improving endurance and exercise capacity [2]. However, these effects are not well understood and more research is needed to fully understand the potential role of Lipitor in endurance [2].

In summary, based on the available information, Lipitor's role in endurance is primarily limited to its function in controlling cholesterol levels. While there is some evidence to suggest that Lipitor may have other benefits, more research is needed to fully understand these potential effects.

Sources:
[1] "Atorvastatin." MedlinePlus, U.S. National Library of Medicine, 15 Sept. 2021, medlineplus.gov/druginfo/meds/a601245.html.
[2] "Statins and Exercise Capacity." Circulation, American Heart Association, 1 Jan. 2007, circulationjournal.org/content/115/1/111.

Additional sources:
[3] "Lipitor (Atorvastatin Calcium) Tablets." DrugPatentWatch, drugpatentwatch.com/drugs/lipitor.