Tabata training: http://www.theglobeandmail.com/life/...rticle1419091/
4 min sessions, high-intensity interval, improves both aerobic AND anaerobic conditioning
http://tabatatraining.org/?p=18
don't let the "high intensity" or the chirpy little chickie in the video put you off: "high" is relative - if the instructor's banging 'em out 90 to the dozen but you can only do 5, then that's high for you - next time, push for 6.
i'm going to find some exercises i can do (can't do jumping jacks - the hip and sacroiliac thing) and let you all know how it turns out.