I'm not a network engineer, but I do know there are at least two (maybe more?) types of CAT5 cable. There is the solid type which are used usually for inside walls or conduits. You don't want to bend and rebend solid cables too much or it will break, kinda like with a paper clip. The other type are stranded cables or more commonly know as drop cables and these are more flexible, tolerable to manhandling, stepped on, etc...