i use both!! the underhand for the front of my head and the overhand for the back i reach directly behind my head and use that positioning see this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-02ryuhPO9tk.htmlsi=ai_thGVLC3lDM1vv to see an example!!