If you want to get in shape, just do a regular routine of cardio and weights and kick the smoking habit. I've found that getting in shape had a huge impact on my game as well, as it helps me keep my energy level and focus up without slamming Red Bulls all night (which never worked since they made me so damn jittery).
By the way, if you are looking to lose weight, stay as far away from Alli as possible. I didn't need to go there, but I did anyway. All I can say is that no matter how low fat your diet is, Alli will make your life shitty for as long as its in your system.