resilience

the ability to be happy, successful, etc. again after something difficult or bad has happened:

Trauma researchers emphasize the resilience of the human psyche.

These are habits that can break down the resiliency you'll need to help you through difficult times.

the ability of a substance to return to its usual shape after being bent, stretched, or pressed:

The plant fibre has incredible strength and resilience.

These new materials have additional resiliency and elasticity properties, as well as great strength.