Getting fitter isn't just about working harder in the gym—it's also about doing the right things the rest of the time.

As hard as you might crush a workout, the real labour happens on the days you don't sweat. When you exercise, your muscles undergo microtrauma. Afterward, what are known as satellite cells fuse to the damaged areas to repair the muscle fibres. But this process can happen only when you're at rest. If you keep exercising, your muscles never get a chance to repair themselves, and your progress will plateau and eventually decline. So taking time off is essential. But if your usual rest day is a date with your couch, cancel those plans pronto, and use these expert tactics to strengthen your recovery.