For those learning how to properly dolphin kick, Monofins are a blessing. They essentially give you a “mermaid tail” which forces your body to kick with the proper motion. Here’s a video of one in action (with a bonus technique to help improve your kick!):
Monofins can be purchased at about $30-$60, depending on which brand and style you want. Here’s one by Finis.
Did you try the monofin out? Comment below how well it worked for you!