That was quick!
Personally, I just like to keep my eyes on the prize, but make sure I have time to decompress. Work hard, and then do what you need to do to take your mind off what you are working towards. I find if you are particularly stressed and you don't break off regularly to find something else to enjoy in the meantime, you are open to burnouts.
Friends also help a great deal!
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!”
― Hunter S. Thompson