You work hard to stack on muscle and the thought of sweating through cardio makes you cringeโ€”maybe because you hate clocking time on the treadmill, or because you fear your well-earned muscle will take a hit. Well, weโ€™re here to change that mindset

Sure, if you run 80 miles a week and never touch a weight, youโ€™ll certainly drop muscleโ€”and fast. But, a certain amount of strategic cardio is not only safe, itโ€™s smart. In fact, cardio can boost cognition and add three years to your life. And better yet, it doesnโ€™t have to suck.

We found eight ways to make cardio more โ€œfunโ€ (or at least not quite as mentally painful)โ€”each with a fat-burning, muscle building) workout routine, all designed by certified personal trainer Kenneth Valentin.

โ€œThe key to getting lean and sustaining your muscle mass, is by performing exercises that combine strength training and cardio,โ€ says Valentin.

From flipping tires to pushing sleds, these killer cardio workouts will build muscle, boost endurance, and shred that layer of excess fatโ€”for good.