One could draw up all different kinds of adversity depending on what your weakness is.
There's physical adversity, that if you are someone that likes exercise like I do, I exercise everyday. When you exercise, there's pain involved and so you're putting yourself through adversity in that situation. It's never totally pleasurable and there are moments where it's kind of boring or painful and you know that in doing that, you're making your mind and body tougher and more resilient. So must be able to deal with the boredom that happens in life.
Things like reading a book or learning a language, or taking a walk - they're not stimulating. Your mind has to sort of learn how to deal with that kind of stimulation on its own. So that's a very important form of adversity.
The point of the adversity is to toughen your mind so that you can handle difficult circumstances in life. Your mind, toughen just like you toughen your body. So it really depends on what you need. It really depends on the individual.
Expand your notion of what adversity is.
There are people that don't need to run towards adversity. They grew up in circumstances where it's forced upon them. Other people lead, pushier lives. So there are all kinds of forms of adversity in the world.