Started my P90X workout! Refer to post #30 to see how much the first day kicked my ass. It would help me if I could get some feedbacks on people who have tried p90x or are currently doing it. I can't really trust all these blogs and videos going around on the internet as much as you lovely TW addicts First off, I just want to know if p90x will be affective for tennis. Sure, I want to look better, but only if it doesn't hinder my tennis performance. Just out of curiosity, how intense is p90x compared to HIIT? I have been doing HIIT for more than a year now with great results, just thought I'd switch it up for now, since I'm on my break cycle for HIIT. Lastly, are there any tips or anything I should know about this p90x program before starting? Thanks a ton!