Turnbuckle writes somewhere in his Longecity profile area: "Ligaments don't improve as fast as endurance and are prone to injury. So just because you can now run twice as far or lift twice as much, don't. Best work into it slowly."
This is what could have happend to me: Being in the 5th month of using 30 mg/month one of my achilles tendons slowly became irritated, which makes me to pause my weekly jogging rounds for 8 weeks now. Before that, my finishing time had improoved a lot (I wrote about this elsewhere in this forum), which to me was clearly one of the positive effects, we hear about in this forum.
However, logic says that other factors could come into play and also, that both achilles tendons should be affected, more or less. But it is only one side.
In any case I felt to underline Turnbuckles statement above as an info for all sporty people on C60. Otherwise I feel very good, still ;-).
I've been worrying about my achilles tendons since having complaints about them in high school. I've always been careful, and have never damaged them beyond their regular capacity to recover thankfully and the best answer I've found is to run in a square! The elipsoidal tracks and turning on streets are killer on your tendons. These days, when I run, I do it on the street and slow down to a momentary stop when I come to a turn and then step softly at a 90 degree angle into the direction of the next street. It's easier to do this if you run on the outside walkway of your "loop."
I also run using a cheap pair of crocs. The only shoe I've found to offer as much comfort and make my knees hurt less are the Nike Icarus line IIRC. But they cost several times more than crocs but have shorter life expectancy as your supposed to replace running shoes every two months. If I was a pro or a rich man, I'd go with Icarus, otherwise croc w/ socks and the back strap work remarkably well for a year or more and can be put in the washer with your clothes when they need to be cleaned.
After suggesting to my mother for years that she should try crocs for all of her feet problems and being told she gets special perscription shoes and inserts that are better she finally gave a pair of garage sale crocs a try and she's filling her closet up with them...
My granny used tell us all that she tried crocs and they weren't that good, but at the same time she'd always say how good of a deal she got buying the generic crocs looking shoes that aren't actually made from the same material. So no matter what you've heard, I really suggest you give them a try. There are alot of look alikes made from standard pool foam that don't provide cushioning for impact running.