Isn't the point of doing cardio work to be tired? To stress your lungs and heart? That's why extreme athletes wear masks while doing cardio... I'm sure a little

Isn't the point of doing cardio work to be tired? To stress your lungs and heart? That's why extreme athletes wear masks while doing cardio... I'm sure a little surgical mask isn't as difficult as this: https://www.trainingmask.com https://www.trainingmask.com