I was made aware of this concept by a good friend of mine in a talk last night.
He pointed out that it's the method that we used to get where we are.
It also seems to link up to other processes , such as working out, or developing any skill.
The concept is that it's the opposite of fragility. With harder experiences, the more you get bounced around, the more pressure put on over time leads you to be refined. It's basically like stone to diamond.
As humans we're antrifragile. It's important to understand that the trials that we go through, shape us. They make us stronger. It's a choice though in many instances. In order to build up skill, you must push in the direction of your resistance. If something is uncomfortable that means you're facing a challenge and have an opportunity to grow through it. Really take this into consideration when challenges cross your mind. Know where you'd like to be, work backward / reverse engineer the process from that end goal, and then understand that adversity and some roughness are necessary to complete that route all the way through. You'll come to see that even more than your objective, the person that you will become through this journey is an even greater reward.
Approach your goals with confidence, and remember, be honest with no apology, be yourself entirely and show us your Realm.