Training with an umbilical hernia?

Hi Marc, am a 27 year old guy and I have an umbilical hernia. I went to the doctor and they confirmed I do have a hernia and suggested that I live life the same way and train the same way as I been doing. The doctor advise that at this time a surgery is not necessary since it's small and not bothering me at all. I would like to prolong the surgery to at least one more year. I do have 2 kids a 9 year old and a 2 year old, I am active with them and I know after the surgery I won't be able to be as active for a few weeks. I was wondering if there is any training you would recommend or anything I should do different? Any abdominal workout I should do to get my abs stronger? Anything I should avoid?

Thanks for the help