Didn't manage to get a run in yesterday, and frankly didn't feel like swimming this morning -- so I ran at the TMO gym instead. Still wanted to take it easy -- after a 5-minute warmup I ran 25 minutes at a leisurely 12-minute mile pace. Then I sped up for 5 minutes, bumping the mph for 5.0 to 5.5. Still feeling good (and having an idea from Runner's World rattling around the back of my head), I spent the last 5 minutes increasing speed by 0.2 mph every minute. The last minute at 6.5 mph was really good -- I felt smooth, I felt warm, I felt loose. Not sure I'd be able to hold that speed for a super long time, but it was nice to do.
Spent a long time stretching afterwards and still feel pretty good, even in my right foot and hip.