Why in god's name would anyone use a treadmill to do HIIT? And I'm pretty sure you can get that kind of workout in under 10 minutes. 20 sounds way too long.
If your gym has a C2 rowing machine, go for a 2k "sprint row" - should take less than 10 minutes and gas your whole body. Technique vids on youtube will help immensely.
If you are new to the PB - please ignore ALL of this stuff, until you've read the book, or at least http://www.marksdailyapple.com/primal-blueprint-101/ and this (personal fave): http://www.archevore.com/get-started/
So the long and the short is that those workouts are enough (along with lifting)? No need to do more?
It depends on her goals right now. For Fat burning I could see 3 a week working very well for a lot of people. I would not suggest it as a long-haul stretegy, but for short term metabolic conditioning they are quite useful.
Skipping rope - 1 min skipping, 1 min marching repeat 10 times for 20 mins!
20 minutes on a tread? Psh.
This rocks it in a fifth the time =)
(Only use more intensity/faster to truly make it HIIT)
YouTube - ‪4-min Workout Tabata Interval: Kettlebell Swings‬‏
Last edited by Karate Lisa; 07-06-2011 at 04:43 AM.
"You can always do more than you think you can !" Sensei Scash