You have a routine. You walk into the gym, head for your favorite cardio machine, and prepare for your tried and true daily workout. But then there are those days when you find yourself snarling at a woman plugging away on your treadmill/elliptical/stepper/bike/etc. How dare she! Doesn’t she know that’s your machine? Now what are you supposed to do? As the proverbial creatures of habit that we are, our comfort zone becomes our natural default—a setback that unfortunately plays out in gyms across America every single day. But if you are already making the effort to work out, we say: don’t waste that precious, hard-to-come-by, designated time by lingering on the fitness plateau commonly known as “the cardio slog.” The cardio slog occurs when a person deludes herself into thinking that an hour of the same exact exercise routine every single day will yield the best (or any) results.