I ran a marathon on Sunday. I never stopped running (save for a handful of 15-second walks so I could gulp down some water) for four hours and twenty minutes. And aside from some minor stiffness in my quads, the only real pain I developed was in my knees—and they flared up only when I was trying to go down stairs.
In contrast, I got a tetanus shot yesterday morning in my left shoulder. It lasted maybe two seconds. And now every time I turn my head, use either arm, try to type, stand up, sit down, grab the phone, scratch my butt or reach up to make sure my hair is pretty for the cameras, I feel like a trailer home after a tornado.
Marathon = minor discomfort
Tetanus shot = KICKED MY ASS