Lipitor is a medication used to lower cholesterol levels in the body. It is a type of statin drug that works by blocking the production of cholesterol in the liver. According to Drug Patent Watch [1], Lipitor's active ingredient is atorvastatin calcium, which is a lipid-lowering agent that reduces the risk of heart disease.

One concern for people taking statins is whether they can still engage in high-intensity workouts. However, according to an article in Medical News Today [2], moderate exercise is safe for people taking statins, even in those with muscle pain. The article cites a study that found that moderate exercise did not cause any significant muscle damage in statin users.

Furthermore, the British Heart Foundation [3] states that statins do not usually cause any problems with exercise, and that people taking statins should aim to exercise regularly to help lower their risk of heart disease. However, it is always important to consult with a doctor before starting any new exercise regimen, especially if you are taking medication.

In conclusion, based on the sources provided, it appears that people taking Lipitor can still engage in high-intensity workouts, but it is important to consult with a doctor before starting any new exercise regimen. Moderate exercise is safe for people taking statins, and regular exercise can help lower the risk of heart disease.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/statin-users-moderate-exercise-is-safe-even-in-those-with-muscle-pain
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/statins-fact-or-fiction