Stretching helps improve your blood flow

Passive stretching, where a partner (like in this filepic) or the use of an accessory or gravity helps you stretch, has been found to decrease blood vessel stiffness, while increasing dilatation. — CareRun

New research published on July 2 (2020) in The Journal of Physiology shows that 12 weeks of easy-to-administer passive stretching helps improve blood flow by making it easier for your arteries to dilate and decreasing their stiffness.

Passive stretching differs from active stretching in that the former involves an external force (another person or gravity) stretching you, whereas active stretching is performed on your own.