It started out as a little twinge.Sunday, I noticed a little pain just above my right heel — my Achilles tendon.It hurt a little walking down stairs, but not enough to keep me off the bike or from taking a brisk walk with the family.Monday, it hurt a little more, especially walking down stairs again, but again I rode — to and from work, at least, 20 miles or so — and played racquetball. By Tuesday, it hurt even more, but I spent about an hour on the bike trainer in the basement, played racquetball for a couple of hours, did another half hour on the trainer. I’m no tough guy, but I figured I could play/ride/run/walk through the pain. Besides, the more I did, the better it felt.Then I woke up Wednesday, walked into the kitchen to make breakfast and felt a grinding from my Achilles tendon. It still hurt, too, so I did what any mortally wounded American male would do: I fired up Google and self-diagnosed myself with Achilles tendinitis.A quick visit to my doctor confirmed he’s at least as Google-competent as I, and, alas, his course of treatment was just as I’d feared: nothing. Specifically, no running, no racquetball, no riding, complemented by a two-week run of anti-inflammatories, physical therapy and ice.So I’m grounded.I can’t remember the last time I spent a week in Lawrence without riding. I can’t remember the last time I spent a week in Lawrence without riding at least 150 miles.But my doc assured me I needed to take some time off now or risk rupturing my Achilles, an injury that would have me on the shelf for months or even a year. So I’m going cold-turkey. I always figured something eventually would knock me off the bike for an extended period, but I assumed it would be something catastrophic, something involving blood and the splintering of bones. It’s not even a sexy injury, something with which to impress others. Fractured clavicle? Ohh. Torn ACL? Ahh. Achilles tendinitis? Meh.At least my doctor offered me hope.”All the stuff you like to do? Forget it,” he said. “Probably the first thing you’ll be able to do, maybe after a week, will be to get on a stationary bike.”Hey, at least it’s a start.