What sort of stretching would help me do leg raises with straight legs?

What sort of stretching would help me do leg raises with straight legs?

how much do you weigh

72kg (158 lbs). I'm just lacking the mobility to fully straighten the legs during the movement.

You aren't lacking the mobility, you are lacking the strength. Sorry to be the one to tell you. Do hanging knee raises and work your way up.

Hey op. Honestly you just need to get a straight leg progression. IDK if your gym has a captains chair but do this if it does, aiming for 3x15 at one minutes rest until you start progressing to the next level, making sure your eccentric portion of the lift is controlled or else your cheating yourself out of actual ab gains. Lying bent knee raises>Captains chair knee raises>hanging knee raises>captains chair bent knee raises>hanging bent knee raises>captains chair straight leg raises>hanging straight leg raises

Not OP, but I'm in the same situation. It's definitely not a lack of strength, I can't even get into that 90 degree position when I raise my legs up from a lying position. Only if I keep knees slightly bent

I'm Rest pauses work beautifully for what I just said, but make sure your first set before the rest pause is 15 reps.
As said its not lack of flexibility. It's lack of abdominal strength. I deadlift 405x3 at 165 and it took me 2 weeks of doing them every other day to go from hanging knee raises to being able to do 6 hanging straight leg raises

Make sure you're doing them with perfect form, having each rep take 4-5 seconds. If you cant make a 90 degree angle with your torso and knees, you need to do an easier version of whatever leg lift you're doing. See this progression for what I'm talking about

More often than not, limited mobility is due to 1 of 2 things:

>Not enough strength
>dysfunctional mobility patterns

poor flexibility is usually a protective mechanism against these issues and is the reason why a pure stretching program can be counterproductive.

As other's have said, stick to hanging knee raises for the time being, but also look for some basic hip strength/mobility videos, maybe even take a pilates class.

How thick can you be to not believe that this could happen due to the lack of flexibility ?
When I started, couldn't even sit on the floor with my legs straight and had to lean back. Was already intermediate in bench/squat/deadlift at the time (shit ohp).
There are mobility videos for weightlifters on youtube, helped me with the mobility issues.