According to a recent Cleveland Clinic study,it is safe to wear a mask while exercising. In this study, 20 37-year-olds ran on a treadmill while alternating between wearing different types of masks. No drops in oxygen or heart rhythm issues were recorded.
If you have doubts, however, it’s always best to consult with a fellow medical professional or your favorite research journals, whether your question is about masking while doing your favorite workout or any other concern you may have about staying in shape.