That's why Malek says flutter kicks can be included in just about any core or leg workout. Her favorite is to incorporate them into a HIIT session for an added cardio boost.

Take your ab workout to the next level with this Pilates ab series! Watch this video to learn three variations of the flutter kick exercise that will get your abs burning! Then try our Flat-Belly ...

Tips for the perfect flutter kicks Keep your back connected to the floor or your knuckles – you want avoid any arch in you back when you do flutter kicks. This can lead to back strain or injury.

Targeted core exercises can help burn fat and tone your abs, but you'll also need to follow a healthy diet to see results.