Today's puke-tastic fun, plus a question

It was a cardio & core circuit:

Circuit 1:

jump lunges, 40, 30, 20
walking lunges, 40, 30, 20
hanging leg raises, 8, 8, 8
SB skiers, 12, 12, 12


Circuit 2:

Jump squats, 40, 30, 20
bodyweight squats, 40, 30, 20

SB rollouts, 10, 10, 10
SB cross-body mountain climbers, 16, 16, 16


Circuit 3:
plyo jacks, 40, 30, 20
regular jacks, 40, 30, 20


SB extended arm crunches, 15, 15, 15
planks, hands on SB, feet elevated, 30 sec. hold


It took about half an hour, maybe a little less. The jump lunges weren't quite as bad as I thought they'd be. The jump squats and plyo jacks were:)

Now, the question: what are your favorite exercises for building core strength? This isn't about cosmetic improvement or getting definition or whatever, because that's just a matter of peeling off the fat and I know how to do that: high intensity interval cardio plus a super clean diet that puts me in a calorie deficit. That's not to say I actually do it, not the diet part anyway, but for now that's neither here nor there. I'm strictly looking to improve my athletic performance, particularly my dancing, and my core is a weak link.