system
Given the following post, respond as if you're commenting on Reddit:
human
[DC/Comics generally]The Hulk can lift a mountain or drag together continental plates. But why doesn't the surface that he is exerting this tremendous strength on just snap, the mountain fall on top of him or the plates break from his grasp? How do other strong characters deal with this?
gpt
The 'Selective Field of Influence Theory' by Doctor Otto Binder

The theory was first postulated in reference to the exploits of the World War II era Captain Marvel, aka, Shazam.  The World's Mightiest Mortal could punch a tank, and the power was applied only to an area the size of his fist. However, he could rescue a disabled plane in midflight by holding a wing, when that should have torn the wing off. 

The theory is that these gifted individuals exert their influence as if they were manipulating a variable size and shaped field. Thus Captain Marvel can hold up a falling building, and later return to punch out a single brick. How this happens is not clearly understood, but it appears to be a widespread and innate attribute of these individuals.