Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. Statins, including Lipitor, are known to cause muscle pain and weakness, which can affect low impact exercises [1]. Joint pain is also a possible side effect of statins, including Lipitor [2]. However, a study published in the Journal of Clinical Lipidology found that statin therapy, including Lipitor, did not significantly affect physical activity levels in patients with hyperlipidemia [3].

In summary, Lipitor may cause muscle pain and weakness, which can affect low impact exercises, and joint pain is also a possible side effect. However, statin therapy, including Lipitor, did not significantly affect physical activity levels in patients with hyperlipidemia. As with any medication, it is important to consult with a healthcare provider to determine the best course of treatment for individual needs.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/classes/statins/joint-pain
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/