ok, so I've been doing HIIT 3 times a week (m,w,f) on my elliptical for about 3 weeks now. When i first started i was able to get through 10 sets of 30 sprint on 1 min jog, jogging at resistance level 2 and sprinting at level 3. but in the last week or so, my performance has drastically decreased. friday i could only make it through 7 or 8 sets, before i felt like jello, and yesterday i only made it through 5. any ideas as to why this is happening? i'm really confused and feel like i am taking a huge step backwards, i also feel like HIIT doesn't really do much for me, does it really work better than grinding out long sessions of cardio? i also do a full body workout tues, thurs, saturday. any ideas?
(sorry if this isn't the right category to file this under)
(sorry if this isn't the right category to file this under)