Based on the information available, there is no direct link found between Lipitor and decreased flexibility in Pilates practice. Lipitor, a medication used to treat high cholesterol, has not been associated with flexibility issues in any scientific studies or reports. It is important to note that Lipitor's side effects primarily involve the cardiovascular system and metabolism, and do not include muscle or flexibility issues [1].

Moreover, Pilates practice is a form of physical exercise that focuses on improving flexibility, strength, and body control. The factors that may affect a person's flexibility during Pilates practice include age, previous injuries, genetics, and lifestyle factors such as physical activity levels and hydration [2].

Therefore, any decrease in flexibility during Pilates practice is unlikely to be directly linked to Lipitor use. However, it is always recommended to consult with a healthcare provider if experiencing unusual symptoms or concerns while taking medication and practicing physical activities.

Sources:

[1] "Lipitor Side Effects." Drugs.com, <https://www.drugs.com/sfx/lipitor-side-effects.html>.

[2] "Pilates: A Safe, Effective Exercise for Back and Neck Pain?" Mayo Clinic, Mayo Foundation for Medical Education and Research, 13 Jan. 2021, <https://www.mayoclinic.org/healthy-lifestyle/fitness/in-depth/pilates/art-20047666>.

[3] "Lipitor (atorvastatin)." DrugPatentWatch, <https://drugpatentwatch.com/drugs/lipitor>.