Switching surfaces can lead to a more effective workout Fact. It only takes your body 3 or 4 weeks to adapt to an exercise routine. Once that happens, it starts to lose its effectiveness. Want to avoid the dreaded plateau, but not sure how to vary your routine? Try working out on different surfaces. The drills you run in the gym will require a lot more strength and stability when you run them on wet grass in the park. Toughen up your yoga routine by taking it to the beach. Or, if you’re really looking for a challenge, try your regular circuit workout on a hill. With a little creativity ...