Thoughtful individuals often get caught saying "Life is a marathon, not a sprint."
To dissect that truth a bit further, though, you must first acknowledge that life is a series of many simultaneous races. And much like how you handle so many other things at once in your life, it's how one balances these races to not run out of breath.
Of the many races that you may be competing in right now, it's important to keep your eyes on each finish line. When you need to sprint, go all out. When you need to keep up with others, maintain your stride, and if you are feeling too tired, don't be afraid to walk.
Just don't stop. There's no reward for those that don't cross the finish line.