Stand with a resistance band looped around your ankles or feet and a towel under one foot.
Make sure the surface is slippery enough that you are able to slide the towel on it with your foot.
Take support if needed.
Then slightly bend your knees and against the resistance from the band slide the towel on the floor and straighten your leg out to the side.
In a controlled manner bring your leg back towards the midline.
Repeat.
