Quote Originally Posted by OakLeaf View Post
Knott knows what she's talking about. If you can relieve the pressure by sitting up, that's a huge red flag that it's your posture that's the problem. Try sitting up to where it doesn't bother you, then leave your pelvis where it is when you come back down to the bars.

But another thought ... indoor bikes often come with really bizarre saddles that don't fit any known human being. If the saddle you were sitting on didn't allow you to put any of your weight where it's supposed to be, it's remotely possible it might've thrown you that far forward.

Do you have the same problem on your outdoor bike(s)? If not, does your gym give you the option of bringing your own saddle? I can't imagine a saddle fitting so poorly it would be contacting your pubic bone *without* giving you excruciating soft tissue chafing first - but we're all different down there.
Darn, I posted a reply but I think it got hung up in cyberspace. Here goes again, more or less.

I haven't had an outdoor bike since I was a kid, so I can't compare.

You might be onto something about the saddle at the class being the problem. The seats were teeny. I tried to push back to make better contact, but then my butt was overflowing off the back (and I'm very small, so it wasn't just extra tush, hehe). I wonder if my ischeal tuberosities are far enough apart that I couldn't make good contact with the seat, and I was thus resting on the lowest/furthest back part of my pubic bone (the part that fuses with the ischium).

That's where the pain was (when on the bike and off it) and would explain why the soft tissue (which is over the highest point of the pubic bone) was unaffected.