Originally Posted by Razor Shines
I've been doing P90x for about a month and a half. And about 3 weeks ago I added a Interval Training program 3 times a week. So far I've just done sprinting. I go 45 seconds flat out and rest for 90 seconds for 8 or 9 reps. I'm so wiped at the end of it. I love the Interval Training though, my brother actually told me about it. He is a Marine and he was telling me that he did some type of HIIT almost every day in boot camp.
But anyway back to HIIT, I think I will stick with the sprinting for a few more weeks and then I want to switch it up to something else. Any suggestions on what I should do next?
Hill climbing. Problem is finding a hill.