If you wanna be able to archieve things, you've got to get in a good physical state. Go to the gym on a regular basis and get ripped. There is no excuse to not do so! Just get your mentality up and give yourself a punishment if you didn't do it (like not eating any more sweets for the week).
Talking about sweets, don't eat shit. Eat the rainbow, fast from time to time and try not to eat anything which hasn't been there 1000 years ago.
If you keep to these two points, you'll get in a great physical state pretty soon.
