Brian Stann took being a “warrior athlete” to new heights, but some of the training he did to get there as a Marine left him with permanent damage to his body — and he doesn’t want to see the same happening to you. Stann attended the grand opening of the Corps’ new High Intensity Tactical Training facility at Join Base Myer-Henderson Hall, Va., on April 15. He demonstrated how Marines can use the premiere functional fitness program designed just for them to work out smarter and faster than they trained in the past. “As Marines, we sometimes think a good…