The Black Rings Workout

I got a copy of my Ringtraining.com newsletter yesterday, in which the availability of black rings was announced (nice). Also included was this workout:

10 Ring Pushups
Row 250 meters
Repeat 5 times, as fast as possible.

I figured I'd give it a shot, but of course I forgot to set the clock. Didn't matter, as I didn't finish. My times for the first four 250m:

• 0:49
• 0:47
• 0:46
• 0:45

After that last one my back started to tighten up, and as it's been giving me some trouble I decided not to push it. Or maybe it was the nausea talking.