Underground Athlete is a small, innovative personal training studio with a cult following. The business is the life work of a sole owner who has served as a US Marine, changed lives, and built Underground Athlete from the ground up. He's invested his whole being into his craft, his clients and their success, all with the goal of helping people transform their bodies—and their lives. This is a man that trains people to become their very best, athletic version of themselves. By suing Underground Athlete, you're suing your own target audience. (Not a good PR move.)
Please reconsider your pursuit of this small business. Don't take them and their clients down just because of their initials. Be the company your fans expect you to be. Stay true to your mission to "MAKE ALL ATHLETES BETTER." Let Underground Athlete continue to use their original mark, and continue to do their work—helping their clients Rise Up.