Dec. 9—ROCHESTER — The sun had already set more than an hour ago, but a group of eight girls were back at John Marshall High School, standing in together in the weight room in the school's basement.

In the first battle of Girl vs. Sweat, workout novice Laura Prangley takes on the hot fitness trend CrossFit to see what in the WOD all the fuss is about. Turns out, burpees and high-intensity ...

CrossFit involves speed, heavy weights and high reps, so coaches want to make sure you know the basics to avoid injury. I found out I had to take Elements, a six-class course about CrossFit's history, ...