Day no. 25 – Kettlebell Swings. Start in a low, wide squat position with a kettlebell in between your feet. With your chest puffed out, abs tight, and lower back pinched, powerfully contract your glutes and swing the kettlebell upwards with two hands until it’s in-line with your face. Under control, lower the weight back to the ground, stick out your butt. Complete 2 sets of 20 reps.