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Another (small) study confirms that face masks do not reduce oxygen saturation during vigorous exercise for healthy individuals. You can get yourself an inexpensive pulse oximeter and prove it to yourself.
Medical Mythbusting Commentary for November 5, 2020 Source: Face masks don’t hinder breathing during exercise, Canadian researchers find
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Observational study cannot prove high-intensity exercise is harmful to your heart
Health Headlines Commentary for October 19, 2017 Source: Too much high-intensity exercise can be bad for your heart, study says Reference: 25-Year Physical Activity Trajectories and Development of Subclinical Coronary Artery Disease as Measured by Coronary Artery Calcium