Being a 2-foot however I needed to continue to give instructions to her as it seemed to take her a while to get the hang of how to use it.
Eventually though, we realised that we would need to give her directions as she pushed it along, so Millie checked clearance at one side while I checked the other and everything seemed to go fine then.
So obviously, the next step in their fitness program will be to take us for a long walk in the exercise machine when the weather improves. Maybe to somewhere with some nice grass to hop on & chew...