Crossfit. Strength, stamina, endurance and flexibility with the Paleo diet. Try to stay away from all the foods that can be refined into alcohol. ( wheat, rice, potatoes etc). Those give you huge spikes which cause the mental crash and burns. Probably this close to a match, your best bet is to eat cleaner. If your long term goal is to get better at 3 gun, I highly recommend you check out Crossfit. Can't tell you how many guys I shoot with also do Crossfit as well. Good stuff and the guy who is in charge of the games is also a shooter.