I made the brilliant decision to grab more weight than Laura during this workout. “You should be fine with five-pound dumbbells,” she says. I can tell you my arms wanted to fall off by the end. Take it easy with your weights and be sure to focus on form. This workout is by far the hardest yet, but don’t worry, things ramp up for our final day, Day 12. Grab some weights and a towel to mop up some sweat.