The tricks discussed in CERT classes (which are well worth taking - very interesting material) is to go to back of store because few people think to. Same with concerts and other events - people instinctively run to the entrance in which they entered, rather than the nearest.

Secondly, if you're in the midst of huge shelves with no escape (like a home depot) get under the first shelf. the shelving won't collapse downwards, but if a neighboring shelf falls sideways you'll be protected.

Harder to do in a real emergency, but good ideas, and thinking them through can be enough to execute them when needed.

Anyway - I highly encourage taking a local CERT class if you're in the US, or finding the equivalent wherever you live.