Pre-Fatigue?
Means that you use an isolation movement to blast a muscle before you start a compound movement such as bench presses, squats, or seated presses. When you commonly bench press, what gives out first? Typically the triceps. The same applies to the legs, as the lower back gives out before the quads. The idea is to use an isolation movement to target the main muscle group without involving the weak link. Lets say you start out with dumbbell flyes on the bench press. The dumbbell flye involves very little effort from the triceps, but strongly stresses the pectorals. By the time you get to bench presses, your pectorals are weakened, but your triceps remain strong. When you perform your bench presses, you can assure that your pectorals will give out before your triceps. You get what I am saying? Here are some examples where you can use pre-exhaustion:
Chest
1. Dumbbell Flyes
2. Bench Presses
Legs
1. Leg Extensions or Leg Presses
2. Squats
Deltoids
1. Dumbbell Side Laterals
2. Seated Presses (dumbbell or barbell