I'm creeping up on week 23 and have been running my whole pregnancy as well as weights (modified of course) like I was doing before. I always ran outside but its gotten too wam so I have moved to the treadmill inside. I recently got a tummy and have gained 4 to 5 pounds so far, and sometimes my muscles in my stomach feel like they are SO tight, like they are fighting against the stretching from my growing belly. Things have been great and I have had no problems or symptoms really,except this and then suddenly yesterday as soon as I began to run, it was uncomfortable. Nothing painful, just a strong pull at my ab muscles that was uncomfortable. I stopped immediately and did elliptical instead (I really only run and don't do the elliptical but it didn't cause any discomfort so I decided on it instead). I have heard there is a belt that can be worn to give the belly some support. Has anyone used something like this? Or run through their pregnancy and have a suggestion? I know people run the whole time and my dr said its fine, but not if there is discomfort. I have no problem making changes for my baby boy, just want us both fit and healthy.