Any benefit to strengthening the abs (transverse especially) prior to tummy tuck?

I would encourage you to tone your abdominal muscles in preparation for your tummy tuck.The better condition you are in the easier your recovery from surgery will be. In particular strong abdominal muscles can help you maintaining your posture as you recover from tummy tuck.

There are no exercises that will correct a diastasis recti.  The only factor which will correct a diastasis is tightening of the muscle with sutures during a tummy tuck.  However, exercising prior to your tummy tuck is a great idea for overall conditioning and weight control.  You will probably find that the results of your tummy tuck will be better if your body is at your ideal weight.Best of luck,

There is no exercise that will type close the diastasis gap. The diastasis is best treated surgical tightening of the muscle. Exercise will strengthen the muscle. This may give you a better cosmetic appearance to the muscle after a tummy tuck if you have very little fat beneath the skin.Earl Stephenson Jr, MD, DDS, FACS