I had a hernia above my navel repaired at age 30. Couldn't run, swim, do pushups, situps, etc. Thoght swimming ight be good, but thought I'd break in half first time I tried it.
Cycling was great and started it a week after surgery. If it hurts you, you'll know it. You might make the scar keloid though.
Was parachuting a month later.
Brian
Des Moines