[alaskanlaughter]

Originally Posted by krampus

Is it even possible to do "true" HIIT on a treadmill? I usually do 30-45 seconds at 9.5 mph and walk at 4.0 for a minute and a half but I don't know if my heart rate rises enough to "count."

Stair stepper and elliptical are good for HIIT - it's torture!

it's possible but I do think HR is what counts....I do treadmill because I love the running...ellipticals throw me off balance and stairsteppers are hard on my knees but I can see how those would be great for HIIT too!

[krampus]

That's totally true. And a good reason to...not do HIIT on treadmills since if you're going CRAZY HARD you might not HAVE the few seconds it takes to manually lower the speed!