So that's me, driving along in Trance Daydreaming State thinking about my Master class Seminar on flexotone and I am imagining myself at my golf course working with about 20 golfers. The hamstring flexotone exercise is not the only one and certainly not the best. But you get other horses, horses with smaller mouths, less room between top and bottom jaw, for whom a thick bit like that can be incredibly uncomfortable. As a consequence, this can put pressure or stresses on a sciatic nerve, resulting in sciatica.