Today you decided to take a nice walk in the forest after you got home from work. It’s a good way to unwind after a long day. As you walk down the trail, enjoying the beauty around you, you hear some strange rattling in the nearby bushes. You step closer to see what’s causing it, and suddenly realize it’s a mama grizzly and her cub. She lets out a loud roar. Before you have time to even think, you’re darting 20 feet in the opposite direction. This is the most stress you’ve ever felt in your life. But what is stress?