Brad Pitt achieved his 'Fight Club' body through this diet and workout plan
Brad Pitt Workout: How to Get His Body
How Can I Get a Body Like Brad Pitt in Fight Club?
Brad Pitt's Fight Club Body?
You perform challenging exercises that isolate muscle groups and you work them out until complete failure! So, Brad Pitt utilized this to his advantage by going for a look that showed off his lean muscle-Tyler Durden look.
So no matter which approach you take, it is your diet that will determine your body composition.