Kneel on one knee, with your front foot flat on the floor. Gently lean forward, pushing your hips forward, until you feel a stretch in the front of your hip.
Place the foam roller under your hip flexor. Support your body weight with your forearms and your opposite leg. Slowly roll back and forth along the front of your hip, from just above the knee to the top of your thigh.
Start in a tabletop position. Bring one knee forward and extend the other leg straight back. Drop your hips to floor. Focus on pressing the front of the back thigh towards the floor.
Kneel facing away from a wall. Place the top of one foot against the wall. Step other foot forward into a lunge. Keep core tight and torso upright. If there is no wall nearby, you can use your hands to stabilize the stretch.