Mild soreness?

Hi again! I recently made a post about trying inflation play for the first time but I have another question.

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Is a little bit of abdominal soreness the next day normal? Ive been doing air and its been working for me but I've been having muscle soreness the following day. Is it just because my body isn't really used to it? I dont really push myself past mild discomfort but maybe I'm going too fast? The pump ive been using just for now is a handheld one but it seems maybe a little much for just starting out?