Bent hollow body holds

So I'm starting over from scratch with hollow body work ...

For Bent hollow body holds.....how much do we have to contract the abs....my back is flat my shoulders rounded off the ground etc...I don't feel like my abs are working hard enough should I be contracting my abs as hard as I can to feel them working

Hi Mike,how much it is not simple to be quantified. the answer it is "the necessary to ensure a smooth fluid roll on the upper back". post a video and i'll let you know if it is enough from your tempo.

Ok thanks do I upload it here?

Never mind I submitted through video review