U.S. Army Coach Reveals the Simple HIIT Workout Proven to Boost VO2 Max in Just Weeks

If you own a smartwatch or wearable fitness tracker, you’ve likely caught a glimpse of your VO2 max, the maximum amount of oxygen your body can utilize during intense exercise. For endurance athletes, tracking VO2 max as a measure of performance is nothing new. But lately, as more people start thinking seriously about longevity, VO2 max, long associated with improved healthspan, has become a much bigger part of the conversation.

"In the Army's Holistic Health and Fitness (H2F) system, we...