Parsvottanasana can be done without the hands in reverse prayer. You can then focus on relaxing your hamstrings so that you can stretch them in this standing forward bending yoga pose.
How to Reap the Many Benefits of Intense Side Stretch (Pyramid) Pose: Parsvottanasana - YogaUOnline
Parsvottanasana (Intense Side Stretch Pose) - Yoga Vastu
Pyramid (Parsvottanasana) – Yoga Poses Guide by WorkoutLabs
Parsvottanasana - Intense Side Stretch — Vajrasati
6 Steps to Master Intense Side Stretch (Parsvottanasana)
How to do Parsvottanasana (Intense Side Stretch Pose)
Parsvottanasana, Intense Side Stretch Pose
Parsvottanasana: What Are Our Intentions?
Parsvottanasana (Pyramid Pose)-Steps and Benefits - Sarvyoga