Normal lang po ba umo-otot ang ari nag babae

I totally understand how that can feel a bit embarrassing or worrying at first! My friend actually asked me the same thing before and she said her gynae told her it is completely normal, especially during exercise, because air can get trapped and then release from the vaginal area. It happens to a lot of women lah, and since you mentioned there is no pain, that is a reassuring sign. Do check in with your doctor or a gynae just to be sure, especially if it ever starts to feel uncomfortable, because they can give you proper advice for your specific situation. You are definitely not alone in this, so don't feel shy about bringing it up with your doctor.