exercise - Difficult to keep legs up during double lying leg raise - Physical Fitness Stack Exchange

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

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All my peers in the gym can do leg raises with no problem, but I can't keep my knees straight at all when I raise my legs. How can I fix this?