Not that I'm training for anything, but I was on an empty MUP last night and have heard so much about intervals that I figuerd "What the heck". So I got onto the big ring, stood, and went as hard as I could for about a minute ot two, hitting around 25mph. Then cool down and do it again. I probably did this 8 or 10 times.

There might be something to this. My legs hurt like hell today.