Gunnar Peterson : (2) " You should be doing something for your body every day. One day it could be a high-intensity class, and the next, it could be as simple as a 20-minute walk with the dog. " - Gunnar Peterson " I really like battle ropes. They’re so versatile; you can get a terrific workout doing a ton of different exercises with them. My clients like them because they’re a good way to get aggression out, too. Had a bad day? Take it out on the ropes! " - Gunnar Peterson