Median, Ulnar, Radial nerve flossing
These three nerves start in the neck, run down the arm, and innervate different areas of the hand. Nerves can get tethered or impacted anywhere along their length causing pain. Flossing aims to get the nerves moving smoothly and without pain. Check with your therapist which nerve is involved in your case.
If you find the “Biggles” exercise for the Ulnar nerve a bit weird or hard to do, here are a few different things you can try.