
I was partially into a set of butterfly intervals this morning when it hit me: Fly is more about shoulder flexibility than anything else.
I was doing 100s on a timed interval, so any change in form that resulted in a change in speed was easily detectable. If something I tried was faster, I would know it instantly because I would finish that interval sooner.
I tried focusing my energy on tucking my head down and bringing my arms together like a dart and gliding on every stroke, greatly using flexibility in my shoulders instead of using brute force to power across the pool. Doing so resulted in completing each 100 two seconds faster and also being not as winded.
Michael Phelps is not just fast. He's double-jointed. This flexibility advantage gives him the ability to easily do what I was trying, probably without even thinking about it.
The point is this: Swimming is the act of getting from point A to point B through a very thick liquid. The time you invest in getting yourself flexible enough to get a clean form as possible is easily just as important as how hard you are trying. Putting in less effort and going faster during my workout today was a great example of how fighting the fluid negatively impacts speed.
So get narrow, get those feet up and together, get streamlined and get faster. It works!