You answer about how many pre exhaust reps can vary. MM said basically pre-exhaust upper body 6-10 reps to failure and then do the compound work with no rest. Pre-exhaust 12-20 reps to failure for lower body (HITTMMW p135). You may have to use a lower weight for this.
Mike Mentzer′s Ideal Workout from p134 of High Intensity Training The Mike Mentzer Way.
Workout 1 Dumbell flyes for pre-exhaust 1 x 6-10 reps Incline presses 1 x 1-3 reps Straight-arm pulldowns for pre-exhaust 1 x 6-10 reps Palms-up pulldowns 1 x 6-10 reps Deadlifts 1 x 6-10 reps
Rest 4-7 days
Workout 2 Leg extensions for pre-exhaust 1 x 12-20 Leg presses 1 x 12-20 Standing calf raises 1 x 12-20 Sit-ups 1 x 12-20
Rest 4-7 days
Workout 3 Dumbell lateral raises 1 x 6-10 reps Bent over dumbell laterals 1 x 6-10 reps Palms-up pulldowns 1 x 6-10 reps Triceps pressdowns for pre-exhaust 1 x 6-10 reps Dips 1 x 3-5 reps
Rest 4-7 days
Workout 4 Leg extensions for pre-exhaust 1 x 12-20 Leg presses 1 x 12-20 Standing calf raises 1 x 12-20 Sit-ups 1 x 12-20
Rest 4-7 days
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