Comment by sgtcodeboy

Certainly can't speak for everyone, but the most effective form of exercise that I have found is Brazilian Jiu Jitsu. Couple of reasons. First: The deeper you get into it the more you learn its primarily an intellectual pursuit - its just hidden in a very physical endeavor. When I'm doing Jiu Jitsu, I have to actively think, engage my problem solving skills, I can't go on auto pilot as I do in other things - rowing machine for instance. Second: Anyone can do it, at nearly any age with any body type. If you're older and not super athletic, your Jiu Jitsu will be different than say a 20yo who is very athletic. But that in no way means your Jiu Jitsu or experience will be any less effective. First time posting on HN. Hope this helps someone.