Give this a try if you seriously want to push your core to failure!!
✅20 x Landmines
✅20 x Hanging oblique raises (10 each side)
✅20 x Horizontal banded pulls (10 each side)
✅20 x Hip raises
✅20 x Dip frame leg raises
✅20 x Decline banded sit ups
✅Dip frame knee raises with a straight leg eccentric lower, TO FAILURE!
✅40 seconds rest afters each set.
📝NOTE: This will be hard!! If you're struggling, you can simply pause and continue when you're ready, but try not to rest for anymore than 20 seconds during a set.