What should you do before starting a stretching routine?

Before starting a stretching routine, it is essential to warm up. This prepares your muscles for the increased flexibility and range of motion that stretching involves. A proper warm-up raises your body temperature, increases blood flow to your muscles, and enhances their elasticity, which can help prevent injuries. It typically includes light aerobic activities, such as brisk walking or jogging, to get your heart rate up and activate your muscles.

In contrast, cooling down is typically done after physical activity to gradually lower your heart rate. Hydrating is important for overall performance and recovery but is not specifically linked to the immediate preparation for stretching. Resting, on the other hand, is counterproductive when you're looking to prepare your body for movement and flexibility exercises. Thus, warming up is the most effective way to ensure that you are ready for a stretching routine.