Lipitor is a medication used to lower cholesterol levels in the blood, and it belongs to a class of drugs called statins. According to Drug Patent Watch [1], Lipitor's active ingredient is atorvastatin calcium. Statins have been known to cause muscle pain and weakness, which may limit the ability of some users to engage in high-intensity workouts. However, recent studies suggest that moderate exercise is safe for statin users, even those with muscle pain [2][3].

According to Medical News Today [2], a study published in the Journal of the American Heart Association found that moderate exercise did not increase muscle pain or damage in statin users. The study included 37 participants who were randomly assigned to either a moderate-intensity exercise group or a control group. The exercise group performed 30 minutes of moderate-intensity cycling three times a week for 12 weeks. The study found that there was no significant difference in muscle pain or damage between the two groups.

Another study published in TCTMD [3] found similar results. The study included 25 statin users who reported muscle pain and weakness. The participants performed a moderate-intensity exercise program for 12 weeks, and the study found that there was no increase in muscle pain or weakness. The study also found that the exercise program improved participants' cardiovascular fitness and reduced their cholesterol levels.

In conclusion, Lipitor users can engage in moderate-intensity workouts safely, even if they experience muscle pain or weakness. However, it is important to consult with a healthcare provider before starting an exercise program, especially if there are any underlying health conditions or concerns.

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.tctmd.com/news/moderate-intensity-exercise-possible-patients-statin-side-effects