B.M.
Hello:
I never had a formal diagnosis, but after my son was born, I could fit 4 fingers between my muscles where my belly button is. I had a C-section, so I had to wait a little while to work on it, but I have a DVD (see info below from amazon.com) that I used and has helped me close it up some. After 3 months of doing only one little exercise, called "The 100", the gap was down to 2 fingers. I then stopped for a while, but have started up again, I figure another 3-4 months and I could have it completely closed.
(complicated description) The 100 is an ab exercise where you lay on your back, then extend your legs straight up. Then, keeping your legs straight you lower them as much as is comfortable (which after a baby won't be far from vertical). While holding that leg position, you 'crunch' up to lift your head off the ground. Goal is to keep your head and shoulders off the floor and the legs in their outstretched position and the small of your back flat on the floor. Now, while in this position, your hands are stretched towards your hips and you start to pump them up and down, keeping the arms straight. You do 100 arm pumps, breathing in short bursts-5 inhale bursts followed by 5 exhale bursts. I find it helpful to count to 50 twice, rather than to 100, because as the effort required increases, it is harder to keep count above 50... If you want a picture of this, send me your e-mail address and I can get you a picture of what it is supposed to look like.
As for the hernia, that may require surgery, but if you can get other things fixed, the hernia operation might be less involved. (I had an umbilical hernia in high school that was repaird through my belly button, 'course, I still wasn't allowed to lift anything over 20 lbs for 6 months after the operation.)
The Method Pilates - Precision Toning and Sculpting by Method (DVD - May 10, 2001)
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Good luck,
B.