In the ab workout Kaiser shared with Shape, she demoed a weighted variation of a standing march crunch. Try this one without weights if you're a beginner or don't have any equipment on hand.
- Start with your right foot extended back behind you and your hands together, reaching up and out to the left (at about a 45-degree angle from your face). Keep your core tight and your weight in your left foot, with little to no weight in the right foot.
- Drive your right knee up and toward your chest as you bring your hands down and twist your upper body to the right.
- Re-extend your hands up and out while you tap your right foot back behind you. Tip: keep a soft bend in both knees.
- That's one rep. Do an equal number of reps on each side.
