Based on the provided sources, there is no direct information available regarding the impact of Lipitor on flexibility during yoga practice. Lipitor is a medication primarily used to lower cholesterol levels in the body [1]. It belongs to a class of drugs called statins, which work by inhibiting an enzyme involved in cholesterol production [1].

The second source provided is a research article that discusses the potential side effects of statin medications, including Lipitor [2]. While the article mentions various adverse effects, such as muscle pain and weakness, it does not specifically address the impact on flexibility during yoga practice [2].

The third source appears to be a broken link and does not provide any information related to Lipitor's effect on flexibility or blood sugar levels.

To determine the impact of Lipitor on flexibility during yoga practice, it is advisable to consult with a healthcare professional, such as a doctor or pharmacist. They can provide personalized advice based on your specific health condition, medication usage, and individual factors.

In conclusion, based on the provided sources, there is no direct information available regarding the impact of Lipitor on flexibility during yoga practice. It is recommended to consult with a healthcare professional for personalized advice.

Sources:
[1] DrugPatentWatch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Zhang, X., Li, Y., Xu, J., & Zhang, Y. (2012). The Effects of Statins on the Muscle Function of Hyperlipidemic Patients: A Systematic Review and Meta-analysis. PLoS ONE, 7(10), e47252. doi: 10.1371/journal.pone.0047252. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/