Each test targets a different area of strength: lower body, upper body, core, and total-body endurance. Together, they give ...

Next-Level Grip: 91+ seconds (unbroken) You're built differently. You've got vice-grip hands, steel tendons, and bulletproof ...

So, are you ready to find out your true fitness age? RELATED: If You Can Hold a Wall Sit for This Long, Your Leg Endurance Is Next-Level Before you take on the challenge, make sure you're doing it ...