At first its fun.  You're performing every day, giving it your all, and loving the thrill of the game.  You strive to do it all and have it all.  You work hard and play harder.  You have a successful career, wonderful family and you're upstanding in the community.

And then it happens, you start to get tired, put on weight, and lose your mojo.  Your get-up-and-go just got-up-and-went.  You feel tired all the time and lack motivation.  You feel like you are losing your memory, have trouble focusing, and have brain fog.