When something is strong and able to recover from damage quickly, call it resilient. If you're rough on your toys, the ones that don't break are resilient.
Formed from the Latin verb resilīre "to leap back," a resilient person is able to recover from an illness or a bad experience quickly. Politicians who are resilient to media criticism do not let critical journalists affect their focus, performance or relationship to their constituents. An object can be resilient also, but in this case, it is not damaged easily, or it returns to its original good shape quickly.