ok, i feel pretty silly. i just bought an aerobic club step full size on ebay, and received it today. i'm really excited to have one! my question is, i thought the risers would attach somehow, maybe click in place as needed, to the step itself. so, you have to assemble step and risers everytime you use them? forgive the ignorance, but every step i've seen appears to be attached to the risers, lol! wish there were a way to keep it all in one part, for ease of putting it away each time.