Gunnar Peterson is an iconic personal trainer best known for his work with celebrities and professional athletes. He’s been known to train Sylvester Stallone, Bruce Willis, Dwayne “The Rock” Johnson, and was the trainer for The Lakers. There is a reason why so many high profile individuals seek out Peterson. He has truly valuable insight into strength training and fitness. That’s why in this week’s episode of Generation Iron’s and Barbend‘s The Mike O’Hearn Show, Gunnar Thompson shares stories of training Sylvester Stallone, Bruce Willis, and how anyone, regardless of money or genetic talent, can transform via fitness.