I saw many people over the Internet suggesting I sit on a cardboard with my feet a little lifted, mimicking my riding position, and then marking the place with chalk to reveal ny sit bones footprints. However, as a ~140kg man, this does not seem to work (no traces left in the cardboard), but I am unsure I did it right.
Could you kindly suggest other methods / how I could make this work? I want this in order to grab a saddle.