Hey Veronica,Spinerval tapes?
So where do Spinerval tapes come from, and are they the same kind of thing as the classes? Tell me more. Sounds like a good resource.
Ayermail, don't worry be happy
As I understand it, the very flattest. But don't sweat it, unless you already have the problem, 'cause 1- zillions of people ride all their lives and never have an SI problem, and 2- the injury isn't caused by the saddle, but by unequal leg strength creating a lot of torque up in the hips and pulling things out of whack over a long period of time. Pedal mashing instead of good spin technique will bring on stuff like this eventually.
Most importantly though, not everyone is even susceptable to this particular irritant. I have hypermobile joints (double jointed) and my ligaments stretch like putty. I also have congenital knee misalignment problems that affected the adjoining joints. And I got hit by a truck. And I'm probably a lot older than you and have years of wear and tear from a really intense fencing career and a lot of nasty skating crashes. You probably have none of these factors.
If your back is killing you, the first thing to try is serious ab work, at least 100 to 200 good quality crunches a day. You work up to this, don't be intimidated. this also strengthens the pelvic floor muscles and stuff in your back. This will improve you in any sport real quick even if your back doesn't hurt. I drop and do them while the coffee drips in the morning.. And getting looked at by somebody like a really good physical therapist or orthopedist (A lot of them are idiots, really ask around) is sometimes warranted.
But this is trivia to you- didn't you just spend 12 hours on the bike doing your first century and having a ball? Don't worry about it unless some jerk (guy) tries to intimidate you with gear inch calculations and you need something esoteric to counter with. Just look up the sacro iliac joint so you'll know what you're talking about.
Actually, it'd be easier to bat your eyelashes in silly fashion and then go find somebody fun and nice to talk to instead.:D
Miss Liz