Body by Science by Doug McGuff, M.D. & John LIttle

An excellent work on fitness through strength training. McGuff is an ER doc & runs a gym. His message (with co-author little): five basic exercises done very intensely (5-10" for each concentric & eccentric rep (at one set), heavy weight, to failure for a total of about 12' duration of actual exercise time, can give you high-level fitness. Does it work? I'm giving it a try. So what to do with the rest of your time? Have fun! A very well-written, argued, and laid-out book. I think that they're on to something, and well worth a trial. My preliminary work that way (finding the right weight to keep the adequate time under tension (key concept) takes a bit of experiment, but it seems to work.