Stretching, along with cardio and resistance training, can work to increase your body’s blood circulation. Oxygen and nutrients are delivered to your muscles and organs, including your heart, through your blood. A strong circulation system supports a healthy body.
Some daily static hamstring stretches I use are the gentle knee to chest hamstring stretch and the more intense hamstring floor stretch.
(stretches from betterdailyhabits.com)
Brad Walker’s stretching tip #3 Warm up prior to stretching. Warming up increases both your heart rate and your respiratory rate. This helps to prepare the muscles and tendons for stretching. Stretching according to Brad Walker