The collisseum here on campus has an indoor flat track (that is really just the path around the section entrances) and along with it a ton of stairs, stairs, and more stairs. Would something like slow jogging around a section of the loop, bounding up the next set of stairs, coming back and slow jogging to the next set do the same as sprints on flatland?

That is a great way of doing HIIT!!! Do it it will kick your butt!!

definetly would be a good workout.

you can also mix things up by hopping up the stairs - it's more intense.

I've done this. Yeah it really got me sore. My quads were killing me the next day as I had trouble jogging. lol. I'll stick to regular sprints since the soreness isn't as bad.

I have never done that before, but I will try it.

a monday can be HIIT on the grass (I am training for soccer, so I need the grass and not the track. Grass is harder to run on and need to get used to it)

a wednesday can be on the stairs

I'll try this=) next week when I go back to school.