Swimming Light Bulb of the Day... DUH

I have not been running lately, and have instead been doing my PT exercises, yoga, cycling, and swimming. Today's swimming light bulb of the day is probably because of all the yoga I've been doing with more balance and core strength exercises.

When I figured out how to engage my core properly (as in, at all? on purpose? ), I felt much smoother in the water. Why did it feel so A-HA? It seems so obvious, and I felt like I figured something out I should already know. I guess I was using my core, but not actively engaging it. Proof that you can read something a million times but until you finally get that light bulb moment, it just doesn't stick.

That's my DUH moment of the day. I expect to be sore tomorrow after this discovery. There's a good reason Michael Phelps and Dara Torres have those abs...