Nothing compares to a healthy mind and body. Sadly with the times when we get to spend a lot more time inside than outside and in most of the cases sitting in front of a computer, changes our health condition without even realizing it. It's sad to find out about it only when seeing a medic, but definitely not too late to do something.
I realized this on my own a bit over a year ago when I started going to the gym regularly and it does give me an energy and mood of happiness that no other activity brings. And I guess that's the feeling of doing something to stay healthy.