Dive into Mike Mentzer’s Heavy Duty Program in our bio 🔗 Mike Mentzer: Heavy Duty Is For Naturals . . . . [Mike Mentzer’s Heavy Duty, high-intensity training (HIT), maximal muscle growth, intense training regimen, training to failure, one set to failure, progressive overload in training, efficient workouts, efficient muscle building, optimal workout routines, efficient strength training, Mike Mentzer workout, Mike Mentzer’s intensity principles, advanced training techniques, heavy duty bodybuil