When you're short on time,traveling, or don't have access to equipment, or this standing ab exercise is ideal. You can also add it to your own custom ab workout!You don't even need a mat to do this tall-knee march with a twist. Somewhat like standing bicycle crunches,this move will exhaust your obliques and rectus abdominis (those six-pack muscles!) while also giving your booty a kind lift.
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lift 2 Minutes to Flatten Your Abs With This Ultrafast WorkoutStart with your right foot extended back behind you and your hands together, reaching up and out (at approximately a 45-degree angle from your face). preserve your core tight and preserve the weight in your left foot, and 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: preserve a soft bend in the knees.
Repeat,continuing for 30 seconds. Then repeat on the left side for 30 seconds.
Source: popsugar.com