The stretchy, sweat-wicking workout clothes that make exercising comfortable contain hidden health hazards. New research shows that the synthetic fabrics commonly used in activewear can leach potentially toxic chemicals onto your skin when you sweat. Scientists at the University of Birmingham in the UK found that the oil in human sweat acts as a conduit for chemical additives in plastics to dissolve from fabrics and be absorbed into the body. Their study focused specifically on flame retardants added to some textiles. However, the findings likely apply to other plastic chemicals like bisphenols and PFAS commonly used in workout clothes. With