My normal workout is the dreaded treadmill, but I've been struggling with shin splints for a couple months now. This is an injury that I think about not at all until I'm on the treadmill, and then I think of nothing else. The pain is significant. Rather than keep skipping workouts, I bought an exercise bike.
I have not been on a bike of any kind in 20 years. I well remember my childhood springtime ritual of ass-pain, so I thought, "Let's break in the ol' butt slowly. I'll just do 20 leisurely minutes."
That was yesterday. Today, I cannot imagine sitting on a bike seat again until, oh, let's say 2037.