Health experts are raising concerns about potential risks associated with popular fitness trends, from the clothing people wear to the technology they use for training.

A Professor of Environmental Chemistry and Toxicology at the University of Birmingham has expressed concerns about toxic chemicals in athletic wear, including leggings commonly worn for both exercise and casual activities. The professor reportedly avoids specialized workout clothing in favor of natural fabrics like cotton, citing concerns about "forever chemicals" that may be present in synthetic athletic materials.

Separately, fitness professionals are warning about the risks of using artificial intelligence chatbots as personal trainers. Apps like Runna, which use AI to generate customized workout plans, have faced criticism on social media platforms alongside other AI tools like ChatGPT.

Users have complained about what they describe as "cookie-cutter training plans" generated by these AI fitness applications. Critics argue that these automated workout recommendations could be dangerous, as they may not account for individual fitness levels, medical conditions, or proper exercise progression.

The warnings highlight growing concerns about both the materials used in athletic wear and the increasing reliance on artificial intelligence for personalized health and fitness guidance. Both issues reflect broader questions about the safety and effectiveness of modern fitness industry practices.