Have you heard of Crossfit? It's a strength and conditioning system that was started in 2000 and has become extremely popular in the fitness community. It's also a movement a lot of smart entrepreneurs are building businesses around. One such person is Peter Keller, an entrepreneur from Texas and owner of FringeSport, a Crossfit and home gym equipment supplier. Peter and I connected on Reddit over at /r/entrepreneur after the Beardbrand case study we published generated a lot of discussion...