The idea apparently, is that you stand on one end with your heel while holding the other end and as you sing a scale you stretch the band as you ascend, reaching maximum extension as you reach the highest note. Does it work? Well, I found that the very act of pulling the band distracted me somewhat from the actual singing, so I'm not sure it achieved much. But maybe I need to give it a few more goes before dismissing it as complete tosh! I can see the logic behind it and maybe with a bit of persistence it might produce something. The wobble board though definitely works. In fact I have a similar device myself, purchased a year or two ago to help strengthen the muscles surrounding my highly dodgy knee joints. So I’ve had a practice singing while standing on that recently and I think the annoying leg twitch may soon be a thing of the past. Hoorah!
Keep y’all posted.