Our team of fitness professionals and product experts does not recommend kipping on a doorway pull-up bar. Door frame-mounted pull-up bars typically aren’t stable enough to withstand kipping motions, and you risk damaging your door frame and gym equipment, not to mention injuring yourself.  Additionally, doorway pull-up bars typically don’t leave enough depth between the bar and the doorframe to kip, so it’s best to perform this CrossFit movement on a different type of pull-up bar (ideally a freestanding one or a ceiling- or wall-mounted bar with ample depth).