heh, okay to add on to my last PM and post in the VA Hometown forum, I hopped in the pool today (been a long time, but it was refreshing).
I did a 100 free warmup, and then tried out that double-pull crap like on the video for 50 yds to get a feel for it.
Did the 500 yds with the double-pull sidestroke in 10:15. I'll admit that a lot of it was me still getting a feel for it, so if I had to repeat it, I would guess 9:45.
I then rested a minute and did the 500 yds with breaststroke in 8:15.
Then I did a few hundred yards free, breast kick, free kick, cause I thought I was done, then I got the idea to try it the old USMC way, which is more like what they call the "sprint sidestroke." I did the 500 in 9:25.
Sooooo... to sum it up:
double-pull sidestroke: 10:15
breaststroke: 8:15
classic-sidestroke: 9:25
I was the most tired after the breaststroke run, it's a lot easier to lollygag with the sidestrokes. I was just as rested following the classic-sidestroke as the double pull one, so I don't see any advantages to it, except I'm biased cause I've never practiced it, and therefore I'm not getting the full benefit from it technique wise.
Looking at the next events, you've got pushups, situps, pullups, and a run.
I'd say the breaststroke primarily uses legs, so I'd be more prepared to do pushups immediately following the swim, than if I used a sidestroke.