For Newbies and Veteran Yogis Alike: Essential Yoga Poses

Sanskrit Name: Upavistha Konasana
English Translation: Wide-Angle Seated Forward Bend Pose
Also Called: Seated Straddle, Open Angle Pose

• Sit on the floor in a straddle position with three to four feet between your heels. Make sure your toes and knees are pointing straight up. Sit with a tall spine or slowly fold forward at your hips, pressing your belly button and chest forward to prevent your back from rounding.
• Either support the weight of your torso with your hands on your legs or feet, or rest them out in front of you.

Read here for a variation that targets one hamstring at a time.