How much time.
So far, I’m about two years in on BJJ and it’s the best decision I’ve made from a mental and physical health POV. I found a local gym, met the teacher and sat in for a few classes. Now, I train about 3-4 times a week for 90-120 minutes.
Effort.
Mentally, it’s like physical chess and it helps me relax. It’s hard to worry about the days problems when you have to be focused on your opponent/partner. Other than, the major learning curve is all mental. Relaxation and breathing are important to learn when your training partner is sitting on your chest lol.
Why this hobby?.
I hate exercise. I’ve tried swimming, running, biking, weightlifting, ball sports and I pretty much hate them all. With BJJ, there’s a self-defense utility that I like and a mental/physical complexity that makes it challenging like a great puzzle.