Stop pulling your belly button towards your spine and/or sucking in your belly to engage your core.
Instead learn how to properly engage your core and reduce intra-abdominal pressure .
This breath is one you will want to learn and incorporate into your life regularly, especially if you are a mama with diastasis recti (mommy tummy), incontinence, and prolapse.
If you are looking for more ways to flatten your tummy, stop leaking, or need a community where you can learn safe and effective exercise, please send me a PM and I would love to have a conversation with you and see how I can be of assistance.