You don't need a fancy CrossFit box to do these, you can use a staircase or a sturdy chair to make these elevated step-ups your glutes' best friend.
- Stand in front of your chair, box, or steps. Lift your left foot, and make sure that it's at about a 90-degree angle.
- Step your left foot up onto the flat platform, press down into the surface, and lift up through your right foot until your right knee is at a 90-degree angle to your hips.
- Return your right foot to the ground and switch feet, repeating the process starting with your right foot on the platform.
- Make sure to drive the lead knee up as you step up, squeezing your glutes and tightening your abs each rep.
- Start with 3 sets of 10 on each side, and add on more reps as your endurance increases.