The Hammer Strength lat pulldown machine, therefore, isolates your latissimus dorsi muscles (that flare to either side of your back), while keeping your form correct.

The Hammer training vest is ideal for serious athletes as well as first-time users. Training with it is great for athletes wanting to increase explosive strength, agility, speed and power.

"The Rock is using a Hammer Strength lat pulldown machine, and he's essentially doing what I'd consider a technique dropset," says Men's Health fitness director Ebenezer Samuel C.S.C.S.