There is a gym near my house that teaches CrossFit. I first noticed it one summer. In 100° weather, folks were outside doing pull-ups. Scant equipment was visible through the huge overhead doors. I thought it was some kind of low-cost gym.
A membership is over $100 a month, which is not low-cost to me. They have no air conditioning, minimal heat, and minimal equipment. No treadmills or elliptical trainers – just run on the street! It seems pretty intense. The gym is popular and my friends who go there love it. They are as fanatical as galoots.
I used to think hand tool woodworking was eccentric. No more!