l wanna get a hangboard to improve my grip to improve my rock climbing grip and install it over my bathroom door. The Problem is, none of my doors have studs.

The recommended place for hangboards is above doors so I am guessing that there has been other people with this same problem. Does anyone have any suggestions on how to hang the hangboard?

l used to have doors in my house that had glass windows above them. What l did was attach a wooden board directly into the frame with screws, then attach the fingerboard directly to this. l drilled the holes for the board prior to putting the board in place. Worked quite well. On the down side every time l used a fingerboard in a training regime, l picked up an injury. l ended up building a home bouldering wall, more space, but much more effective and less injuries

Ok, l think your doors must have studs, otherwise what would the trim be nailed to? Anyways, hangboards usually have at least holes for screws, so l would say just use lots of screws. If you're still worried, use drywall screws for the place where you do not hit anything.