Begin in Downward Facing Dog pose (Adho Mukha Svanasana).
Step your right foot forward between your hands.
Place your left knee on the ground behind you and slide it back until you feel a stretch in your left hip flexor.
Keep your hands on the ground or lift them to the sky and hold for a few breaths before repeating on the other side.
Guide d'Exercice Runners Lunge - Entraînement Quads | MuscleWiki