http://pinoyathletics.info/2013/10/the-pool-circuit-for-conditioning/

The Pool Circuit was born after deep-water running was discovered, and well after the Judo Circuit was formulated. It was either a sign of my insanity as an athlete or perhaps just a response to the inner delight I felt when first I unleashed a crude form of it on Coops one morning (who will no doubt remember this and many subsequent occasions as his introduction to bile). I have since regarded it as a neat cross-training activity, and you can use it as a substitute for the Judo Circuit in your program, or simply as something different for the week. It’s a good workout and great fun. You need two people to do it properly.