I used to routinely run about 35 minutes each day. This was interval style running with 30 second sprints every 7 minutes or so. I kept this up for about 2 years. My stamina increased greatly doing this, but I didn't loose any weight.
Recently, I've cut out the running and started to cycle to work, which is 20 mins each way, and in only 2 months I have lost heaps of weight.
Although I do do 5 mins more exercise on the bike, I would have thought that running would be a more intensive work out, what with supporting your own weight more and not coasting.
I'm just curious: is there any reason why cycling seems more effective for me?