https://community.usms.org/swimming/f/pool-training-and-technique/32915/underwater-kick---my-biggest-lesson-by-farThis is the 5th stroke for swimming now - it has totally changed the sport - short-course of course much more since you can do it 2x. Why are times so much faster now - underwater kick and suits - that is the answer without a doubt. It seems easy - ween-USTelligent Community 12