I am no exercise addict, but I do have the willpower to exercise almost every day. Hell, I'll even exercise twice daily! Though I suspect I shouldn't.
I've read a bit about exercise recovery (I'd like to say "A lot", but by comparison, I suspect it's not that much). There's a lot of emphasis about exercise recovery.
What do we need to recover from? I know our body starts out using glycogen (first the glycogen stored in the muscle, then the liver?), and if we continue to cause trauma to the muscle without letting it heal properly first, we will lose more than we gain. But how much time do we need to recover from different types of exercise?
For example, I've come across claims that you should get a day's rest between HIIT sessions. However, in the Tabata study (I have very little patience. a 4-minute workout? PERFECT! though I do get too close to vomiting...), the subjects worked out 5 days a week (4 days a week on the Tabata protocol, 1 day 30-min endurance followed by half the tabata protocol - 4 sets), which means at least 2 consecutive days of HIIT.
So the question is, what does one need to recover from, and how long would it take for, say, someone who isn't especially well-conditioned? (of course, I know this is variable, so I don't expect a precise answer. I'm asking for you to shed as much light as you can on the subject :) )