The best replacement for flutter kick is dolphin kick.

The best alternatives to flutter kick are rated as following:
★★★★★  dolphin kick
★★★  scissor kick
★★  frog kick

Your alternative for flutter kick is not listed? Suggest!
Speaking about flutter kick, one probably shouldn't forget about breaststroke.

Other search terms related to flutter kick and their ratings are:
★★★★★ breaststroke
You have in mind a companion for flutter kick and it is not yet here? Propose!



Google Trends

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flutter kick
dolphin kick
scissor kick