Like you, I fast walk everyday. My goal is 3 miles a day. I also do floor exercises and stretching, most of which are necessary for orthopedic PT, but they do alleviate some of my anxiety as well. I’m a poet, so immersing myself in creative writing helps a great deal too by taking me out of obsessive thinking. And yes, I have a low-dose benzo prescription that I use sparingly when all these other strategies don’t work for extreme episodes of anxiety.