Finally, here is an awesome kicking drill you can do in your dryland. You don't really need the physio ball, you could do it on the bed or couch for instance, but it's probably better with a ball. Bottom line, this is what you should feel like when you are kicking in freestyle. Clearly you will need to be strong in your plank to be able to do this exercise, but also to be able to kick like this in the water during your freestyle. Add this to your workout routine.