"Fast", by the way, is relative. I wouldn't win any races, but it was fast for me. I've finally broken my 40 minute mile pace that I've had since I started my mile swims when I was 15 years old. That's 21 years of being stuck. Old habits hang on tightly, but they can die quickly with a little help. My pace today: Mile 1 - 38 minutes. Mile 2 - 34 minutes.