Stand with your feet shoulder-width distance apart, feet parallel. Bend your knees, lowering your hips deeply, so your thighs are parallel with the floor, keeping your weight back in your heels.
Then rise back up, straightening your legs completely and lifting your right leg out to the side, squeezing your outer glute.
As you step your foot back into shoulder-width distance position, squat down again. Then stand up and do a side leg lift on the left side. Lower your leg back to the starting position.
This counts as one rep.
Keep alternating sides for 45 seconds. Take a 15-second break.