Abdominal crunches can either make or break your body (literally). It is so easy to perform them wrong for many reasons and performing a total engaged abdominal crunch is blimen tough.
Take a look at this reel of mine to maximise your abdominal crunch
If you can make these changes and use these tips in all of your workouts, you will see a difference in your abdominals.
Be patient and expect the exercises you've already been doing to feel a lot more challenging. The ladies in my online exercise classes feel and see the difference. The technique does change your beautiful body- work with it.
I hope this helps as it's an absolute game-changer, especially for us mothers.