The piece that follows is still too lukewarm to satisfy me, but at least the basic point is correct - intensity trumps duration when it comes to cultivating fitness. There is an exception to that rule of course - if you want to be able to work not-very-hard for hours, you will have to suffer long, low intensity workouts. Good luck, hope you enjoy them.
http://www.msnbc.msn.com/id/35581793/ns/health-fitness/
""High-intensity interval training is twice as effective as normal exercise," said Jan Helgerud, an exercise expert at the Norwegian University of Science and Technology. "This is like finding a new pill that works twice as well ... we should immediately throw out the old way of exercising."
Intense interval training means working very hard for a few minutes, with rest periods in between sets. Experts have mostly tested people running or biking, but other sports like rowing or swimming should also work.
Helgerud recommends people try four sessions lasting four minutes each, with three minutes of recovery time in between. Unless you're an elite athlete, it shouldn't be an all-out effort.
"You should be a little out of breath, but you shouldn't have the obvious feeling of exhaustion," Helgerud said.""
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