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.

Most swimmers opt for the front crawl, which features an alternating overhand motion of the arms and a scissor or flutter kick to propel swimmers forward. It is the fastest stroke of the four ...