In my humble but informed opinion as a Health & Performance Optimizing Physician MD & Researcher this is the single ALL TIME BEST exercise for improving humans. Its been around for over 4 million years & our ancestors did it their WHOLE lives yet today almost NO one does it. Nothing leaves your more short of breath/winded in just 10 seconds than this. No other exercise or physical activity was more important to keeping humans in the gene pool surviving nor had a better impact on your quality of life than this! What is it? SPRINTING. Watch my video why this invaluable exercise present & critically important for 4 million years is only now just starting to make a come back and why. If you are unhealthy and want to improve yourself you are going to want to watch this video. Nothing else can even approach the health optimizing potential of sprinting. As with any new exercise regimen discuss with your provider first to make sure you are medically cleared to start sprinting & while you are at it….ask them if they sprint and why not. We cant possibly get our population healthy if Physicians remain as unhealthy as they are. Share with others, comment and if you like the video give it a like and consider subscribing. For Your Health NOT My Profit…..Sean