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I think @drtowfigh once mentioned the benefit of exercising the core in reducing the chance of the hernia getting larger, possibly also reducing pain/discomfort. I advocate exercising when one does watchful waiting. As for hernias healing by themselves, that would probably require the tissue that gave way reshape itself regaining its original strength, maybe in the future with genetic engineering this will be possible, who knows.
Ps: whoever got a successful surgery in this forum will likely recommend that one gets their hernias fixed surgically asap…