The idea of these hamstring stretches is to help you improve hamstring strength and flexibility. They can also be used to help work towards front-to-back splits by teaching you how to use and control the front leg in that pose.
Hamstring stretching yoga poses
Lying Hamstring Stretch
Tight Hamstrings? 9 Lower-Body Stretches For Walkers
Key Basketball Warmups: Hamstring Stretches - Teach Hoops
Proper Hamstring Stretching, You Shouldn't Feel It In Your Foot
3 Powerful Stretches for Tight Hamstrings
Hamstring Stretch: 6 Easy Ways to Stretch Tight Hamstrings
Lower Leg Exercises Supine Hamstrings Stretch
Easy hamstring stretches to prevent injury
Standing Modified Hamstring Stretch Exercise Demonstration
A guide to basic stretches - Mayo Clinic
Can't Touch Your Toes? 8 Hamstring Stretches for Beginners — Dani
Stretches for Hamstring
4 best hamstring stretches for runners with tight hammies
The 10 Best Hamstring Stretches to Relieve Tightness (Because You Feel Like You're About to Snap)