I've been doing pilates recently and we often do a lying leg raise, either with or without bent knees: Doing a singular leg is fine for me, I have no issues. However doing a double leg raise and I
10 Hamstring Exercises to Strengthen Your Lower Body
exercise - Difficult to keep legs up during double lying leg raise - Physical Fitness Stack Exchange
Knees to Chest Stretch for Low Back Muscles
Straight Leg Raise Exercise • How To Do Properly
The Best Inner-Thigh Workout Exercises At Home, According to Trainers
Lying Leg Raises, What Are They? Muscles Worked? Benefits?
How To Master The Hanging Leg Raise - SET FOR SET
Straight leg raise (SLR) Exercise - Health Benefits, How to do?
How to Do Leg Lifts: 5 Ways to Strengthen Your Core