Leg raises and flutter kicks

[GardenElf]

Hello, hoping for some advice. I really struggle with these exercises and with keeping my back flat against the floor, I can feel I'm at risk of straining my lower back by arching it. But fine with other core exercises (crunches, bicycles, planks, dead bug, russian twists etc).
What can I do/strengthen to be able to do proper leg raises and flutter kicks? Or just keep trying very little at a time to avoid hurting my back?
Thanks in advance

You could switch to standing core exercises maybe?
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I used to have this issue and Pilates seemed to help. Try Lottie Murphy on youtube.

Hands under bum ?

Start small, even just one rep. As soon as you feel your back engaging stop. Just build up, as your core strengthens you’ll be able to do more

Just don’t do them if your back is arching. Find another way to work the same are.

Hands under bum and slow right down until you can keep your corse engaged throughout. Then gradually speed up as you gain strength

@GardenElf
Hello, hoping for some advice. I really struggle with these exercises and with keeping my back flat against the floor, I can feel I'm at risk of straining my lower back by arching it.

Your back shouldn't be flat on the floor, but in the neutral position with your core engaged. Fists under bum help.

Go to pilates. Learn what neutral spine feels like and how to engage your TVA.

Also for leg raises, swap for leg lowers (legs straight up in the air, lower slowly till you feel your back starting to want to arch, then stop and bring them back up) and for flutter kicks keep your legs higher.

Thanks for the ideas and tips everyone, will try some of the modifications and persist!