If you want to help your butterflyers go fast, you they need to...

But it’s not only about power.
Swimmers need to time the pull with the kicks to maximize the impact.
Kicking upon entry helps swimmers set up the stroke effectively.
Here’s a simple way to help swimmers feel these skills.
Have them perform pulldowns underwater, but kick twice, right before starting the pull and right as the pull finishes.
Make it even more effective by using different hand postures or adding resistance to load more power, or use DragSox or fins to emphasize kick timing.
The right skills and the right strategies to help swimmers learn them.
The HOW matters, too.
Set design is critical, yet it’s more than that.