I would ask your consultant. At a guess I would say yes, anything that causes larger abdominal pressure puts more pressure on the hiatus.
On saying that my hernia has grown in 9 months from <1cm to now 3cm and all I have done is the usual house chores, I'm not overweight so go figure.
You may have a much stronger diaphragm than me, and you could be just fine, but I would ask your consultant as he would surely have had cases of this in the past.
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