High intensity training has become very popular lately...as evidenced by the widespread success of Crossfit, P90X, Insanity etc..
If you have a little time, there's a link to a radio interview of Sabina contained within the article. It's a fairly long program. Sabina's starts approximately mid-way through. She's very knowledgable.
Crossfit enthusiasts in particular will appreciate the entire program.
Bye for now...