working on a startup is not a sprint, its a marathon and you need good health to run it. Maintaining health is vital to your thought process and your ability to make better decision.

As an entrepreneur, I workout 5 days a week (sometimes more), and it only takes away 1.5 hours of my time. And during which I listen to podcasts, or think about feature designs, etc. so its not total 1.5 hour lost.