I would say the BOSU would be a better substitute for the step with very basic/athletic choreography step workouts that might utilize weights and/or other equipment in a circuit, etc. as opposed to workouts with just complex choreography that focus on the footwork. I do not have Cathe‘s step...
I so wish Cathe would do some workouts using the BOSU!! It
has so many uses - balance, easier for joints, strength (holding
it out and overhead), core work and using it to replace step. Can you
tell I LOVE my BOSU?? :cool::):D