Similarities:

Blood flow, Cardiovascular stress, stimulus nerve/muscle/tissues, hormones/Thyroid, increase hr, increase vasodiolation, Autophagy/Apoptosis, Cell/DNA Repair, Increase brain function = Decrease Dementia/Alzheimer's, Improves sleep, Decrease depression/mood endorphins

Differences:

Cardio High Impact vs Sauna no impact, Cardio high Joint Stress vs Sauna No joint stress, Cardio increase Cortisol vs Sauna Increase HGH, Cardio Max Heart Rate vs Sauna Moderate HR (70-80%), Cardio Increase inflammation vs Sauna Decrease inflammation

Solutions:

Conventional Dry (175degrees) & Finnish steam (20-40% humidity), In fared (140degrees) Time/Duration progress Temperature Progression

Recommedations:

20min. 4-7x week, post exercise benefits  ...