Day no. 23 – Dumbbell Side Lunges. Stand tall with two light dumbbells. Take a large step to the left and squat down laterally until your left thigh is parallel to the floor and the dumbbells touch the ground. Sit back over the back half of your butt, with most of the pressure on your heels — resist any pull to hunch forward. Press through your butt and return back up to start. Repeat for the right side and continue to alternate. Complete 3 sets of 30 reps.