I mainly use my Spiky Ball massager to massage the soles of my feet before bed.
The first 3 or 4 times I used my Spiky Ball my feet felt tingly for about an hour or so afterwards. Now, my feet & ankles feel so much better every day.
I haven't had a cramp or Charlie Horse in my feet or my "problem ankle" since - as long as I massage my feet & ankles each night.