for you when you've ran all the miles you want to run and lifted all the dumbbells your biceps can handle (no such thing btw), or you've squatted ALL. OF. THE. SQUATS?
What do you do with your conditioned body?
What do you do next to maintain your interest and end that perpetual cycle of "just working for that next, long weekend holiday or vacation beach body"?
What use is that body if you aren't going to actually use it?
You CAN have more substance in your fitness, more purpose with your physical body. Those pretty muscles are great, maybe for getting laid, but is that all you're going to use it for? The jokes in that answer are abound, but in reality think about it, do you do it for you?
Live your fitness. Enjoy your fitness. Do it for you, do it to feel healthy, do it to feel fit and athletic. A healthy, mobile, agile body will be there for you 100% more than a one night stand.