I do many different types of exercises for training. Lots of pull-up variations: weighted, explosive, wide grip, etc. I also like keeping my legs & core strong through squat variations & deadlift variations. To get my fingers strong, I hangboard, block pull, and structure my climbing sessions.
People climb for all sorts of reasons. I climb because I like how it encourages self-discovery. Along my journey, I've learned more about movement/my body/my mind/nature/and a really awesome community. Think of a day out climbing like you going out into nature with all of your buddies to go solve really fun and challenging puzzles that make your mind and body and friendships stronger.
Haha, they are good friends of mine who were on the other side of the boulder I climbed. I was so pumped and had to yell for them. Thanks for the support, buddy!
For grading things in rock climbing, we compare the given grade of what we are climbing to the intensity & complexity of what we've felt during the climb. The way we can separate if we are climbing one grade or the other is by having lots of climbing experience (especially at the given grade). I hope this helps! Let me know if you have any other questions!