With your older clients or those with less balance, you might even need something to hold onto, but ideally you want them to try this without help if possible. If you noticed your clients not fully lifting their leg or trying to get it back to the ground quickly you might allow them to put a hand on a wall or chair.
You can also do this exercise dynamically moving across the room as opposed to just stationary. For some people it helps to give them a visualization — think of it as swinging your leg around something, or over something. They might not be able to visualize what a hurdle is, or have any reference for that from track and field. Some trainers I know even refer to this as the Hydrant drill... you know, the dog peeing on a hydrant. Trust me if you use that analogy your clients will ask for an extra demonstration from you!
