hypothetically speaking

If you happen to be a geeky writer who spends most of his day sitting in front of a computer screen, and whose only cardiovascular exercise comes through his fingers, by typing on the keyboard, then DON'T accept an invitation to go mountain biking with your wife's co-workers. Hypothetically speaking, of course. Especially if you're hyper-competitive. And if you're riding somewhere in the rugged Pisgah National Forest. And if the aforementioned co-workers are hard core riders. Because if you do, you'll practically need to overdose on Vitamin I (also known as Ibuprofin) the next morning. Not that I know from experience.