Why is it when I plank I feel my back is going to snap?

Anonymous
I am quite good at doing the plank i managed 8 minutes before but haven't done it in ages and could only do about 4 minutes because i literally felt like my back might snap, obviously it would not but it was really weird
i have a very bend it back, haha
Why is it when I plank I feel my back is going to snap?
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