Speak Up: What Exercise Do You Find Most Intimidating?

Even the most fervent fitness fanatics have things we just won't do. I'm all for taking up new fitness habits, but they don't always stick. I shy away from ice climbing, and I have friends who are terrified of surfing.

Some fitness fears are more basic: maybe you've always wanted to take group kickboxing classes, but the thought of keeping up with the steps keeps you up at night. Or perhaps you shudder at stepping into the free-weight section of your gym. So let's get it off our chests: what form of exercise do you find most intimidating, and why?