I am now attending fitness sessions at the police academy two nights a week. They are three hours long. I'm in pretty good shape (decent strength, bomb hill sprints) but we run 3 to 4 miles and then do calisthenic circuits. After the run I was super lightheaded and crapped out during the calisthenics. It wasn't so much that it was too much for me to handle, I just had no fuel. What should I do or supplement with to prevent this problem in the future?
Try some Surge Workout Fuel throughout the workout. I would mix anywhere from 4-5 scoops of Workout Fuel and drink it some before you start and then every half hour.
You could also mix in some Mag-10 to really combat the the catabolic effects of the sustained cardio.
Make sure your muscle glycogen is full as possible:
Eat a decent amount of complex carbs in the hours before and maybe some quicker digesting carbs before training. Then worry about additional supps like creatine (not much help for the run but will help afterwards) or stimulants.
Well played, sir. Now spread'em.