Kneeling Hip-Flexor Stretch
Kneel on right knee, with toes down, and place left foot flat on the floor in front of you, knee bent and aligned with ankle. Place hands on left thigh [shown].
Press hips forward until you feel tension in the front of your right thigh. Extend arms overhead, with elbows close to head and palms facing each other, and slightly arch your back while keeping your chin parallel to the ground. Hold for 30 seconds, then switch sides.