Try these three quad stretches before and after your run to help maintain and gain flexibility.
5 MIN PRE-RUNNING STRETCHING - WARM UP FOR RUNNERS
Essential Stretches for Runners
Essential Stretches for Runners
The Must-Try Quad Stretch for Runners
The Importance of Stretching: Essential Fitness and Health Tips
Essential Stretches for Runners
Essential Quad Stretches
Running Tips: 3 Essential Quad Stretches
Best Quad Exercises for Runners: Prep Your Legs for Downhills
Essential Stretches for Runners
荃灣田徑長跑
5 Pre-Running Stretches for Running Faster Sprints (& Track)
Leg Stretches: Improve Flexibility