I'm always up for a challenge, so I decided to spend 30 days doing flutter kicks, in an attempt to master the exercise and get an even stronger core.

Flutter kicks are an awesome core move to tone your lower abdominals. But you need to do it correctly to get the benefits. Here's how to do flutter kicks.

Flutter kicks are an excellent way to work the hip flexors, which, in turn, will help you with sit-ups, swimming, and swimming with fins.

I added a flutter kick in for 10 seconds in some of the sets. I didn’t track these consistently, but added them in when I felt like my abs could use the extra burn.