Umm.. First, I would get it done laparoscopically if your surgeon has a lot of lap experience. It has a longer learning curve and a higher recurrence rate in the beginning of a surgeon's experience. However, when done properly, you will have less pain, faster recovery and less risk of nerve injury or infection.
Regardless of the technique, in the first 4 weeks (at least) after surgery, the more you use your abdominal muscles, the more likely the chance of the hernia coming back. At least that's how the teaching goes. And slolom skiing uses a lot of abdominal muscles.
After six weeks, the mesh will be healed well enough in place that it won't really matter what you do.
If you have an umbilical hernia, then that would be fixed on the way in automatically if your repair is done laparoscopically. Otherwise, it would need a separate incision.
Lastly, excess fat does not help.
Laz