Hi! I have a question about form to keep on bent hollow body hold. I understood that my lowerback must be in contact with the ground. But what about upper back? I mean, Do i have to lift up my upper body as much as I can so that most of my upper back is off the ground (like in first pic)? Or better if I hold it in contact with the floor (second pic)? I found the first one more stressful for my core, is it correct?? Which is the right one?
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Thank you!