I did three sets of 8 tabatas this weekend. On Saturday, I did the first two as walking lunges and the final 6 as squats like the video with 3lb weights. On Sunday, I did one set all with abs (alternating toe touches while lying down with an oblique exercise) and another set on the recumbent bike, pedaling really fast during the 20 secs., and pedaling as slow as I could during the 10sec. rest periods.
My glutes have been screaming, but DH massaged them yesterday and I think that helped.

I feel it when sitting down and climbing stairs, but I can do both without my legs feeling rubbery, so maybe it wasn't hard enough of a workout? I may need to do more lunges...though I thought I'd die after doing the two sets!
Do you think it works as well if you don't totally rest during the 10 secs? On the bike I couldn't stop pedaling or it would die--then it'd be hard to get going on the next set. Our ellipticals work the same way. What do you think?
CeCeLee, thanks for the tip about asthma! I definitely needed my inhaler on Saturday--used it just before starting and then again partway through--but I didn't bring it on Sunday and didn't really feel like I needed it.
Amanda, do you mean that you jump at the top of the squat thrust (a.k.a. during the "thrust" portion), or were you just talking bout jumping during your lunges?