I bought a pull-up/chin-up bar to hang from my door frame.
The instructions state that it is not to be used for walls made out of drywall/rigips. The hollow noise I hear when knocking on said wall though makes me believe that is exactly what it is made out of. This goes for all the door frames in my flat. One such door-frame looks like this, from either side:
The building is from 2007, so I suspect that door frames in most other new buildings are enclosed in similar types of walls. Thus, I cannot imagine that this pull-up bar is only to be used in the very few cases where the door frame is encased in a non-drywall (concrete) wall.
How much of a risk would it be to use the bar with this kind of soft wall? My weight (80kg) is well under the maximum load of the bar itself (150 kg), so the worry is really just about damage done to the drywall itself, assuming this is where most of the force will be dissipated (and not onto the door-frame sides).