If You Do Lots of Cardio, These Before-and-Afters Will Make You Want to Hit the Weights

If you're doing hours and hours of cardio to lose weight, these before-and-after pictures just may inspire you to ditch your runs and reach for the dumbbells and barbells instead. While doing cardio does burn calories, weightlifting builds lean muscle mass and speeds up fat loss, which means you'll lose weight faster — if that's your goal.