Using BCAAs on work out days (when I work out in the morning) before and during my workout. Tuesday/Thursday I box at 6am and M-W-F I work out either first thing in the morning or early in the afternoon.
Honestly, I planned on starting with only 1 fast per week, but the first day was seriously a piece of cake, so I just went in to a 12pm-8pm schedule Monday through Friday right from the start.
Ive lost a touch of strength on my bench but surprisingly have gained a few pounds on my squat and dead. That plus my energy while working out fasted is through the roof.