Hi Tarachristo,I also used a treadmill for exercise during my recovery, but I never noticed my stomach bloating because of it. I'm guessing you still have some residual gas that is moving around with exercise, and it ends up in front. Honestly, I have no idea...wish I could help. I'm sure, though, that it's temporary and will resolve with time. Keep up that walking...it'll definitely pay off in the end!
Take care,
Denise