Long, baggy pants can catch on exercise machines like stationary bikes, where the hem can get stuck on the pedals or the water bottle holder. Harris has had to help untangle pants from bikes in some of her spin classes at Crunch. Long pants are also out of place in another class Harris teaches: pole dancing...and not for the reason you're thinking. Harris says that pants-clad legs slide right off the pole because they don't provide the same kind of grip that bare flesh does. Your best options for most classes are capris, slim-fitting long pants or shorts.