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Skip to contentāBecause I had worked in pre and post-natal fitness before, I was aware of diastasis, but itās not the same until you go through it yourself,ā Haley, 37, tells PEOPLE. āRight away when I found it, I backed off from doing any severe core conditioning. For some of us, it is hard to accept because you are fit, you feel fit, but there is danger in doing [core exercises] and lifting large amounts of weight during pregnancy.ā