The 15 Best Weighted Vests for Any Type of Workout Milan Polk, Brett Williams, NASM When you feel you've hit a plateau on bodyweight workouts or cardio, weighted vests can add needed resistance for every pushup or run. The affordable equipment can add an extra challenge to any workout any time of the year, but they're most commonly used on Memorial Day for the legendary CrossFit workout called Murph. The full-body fitness test combines a grueling workout with honoring a fallen war veteran. Originally called "Body Armor," Murph became an official CrossFit challenge in 2005, and continues to push people to the limit to this day.