Lipitor is a medication that is commonly prescribed to lower cholesterol levels in the body. While there is no direct evidence that suggests that Lipitor affects breathing exercises, there are some potential side effects of the medication that may indirectly impact one's ability to perform these exercises. For example, muscle pain and weakness are common side effects of Lipitor [1]. This may make it difficult for individuals to perform exercises that require significant muscle engagement, such as certain breathing exercises.

Additionally, a study published in the Journal of Physiological Sciences found that statins, a class of medications that includes Lipitor, may reduce respiratory muscle function in some individuals [3]. The study found that statin use was associated with a decrease in maximal inspiratory pressure, which is a measure of the strength of the muscles used in inhalation. However, it is important to note that the study was conducted on a small sample size and more research is needed to confirm these findings.

Overall, while there is no direct evidence that suggests that Lipitor affects breathing exercises, the medication may indirectly impact one's ability to perform these exercises due to potential side effects such as muscle pain and weakness. Additionally, there is some preliminary evidence that suggests that statins, including Lipitor, may reduce respiratory muscle function in some individuals. It is important for individuals who are taking Lipitor to speak with their healthcare provider if they experience any difficulties with breathing exercises or other physical activities.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[3] https://jps.biomedcentral.com/articles/10.1007/s12576-018-0649-x