I may sounds like a broken record here but it is something I am asked almost weekly. How do I get a stronger core and flatter tummy. I touched on this on a previous post but a flatter tummy comes from a healthier diet. When it comes to conditioning the core, sit ups and crunches are not the way to develop that kind of strength. Those focus highly on our Upper Abdominals, which in many of us are dominate to begin with. With shifted pelvis's and collapsed rib cages. Many of us have overused Upper Abdominals.
So how do you develop a stronger core. Remember Core is found hips to shoulders and 360 degrees around. Therefore, that's a lot more ground to cover than just our abdominals. We have glutes, chest, back and shoulders to consider. Building stability in our core can be done by learning to properly master a squat. Getting our posture down. Fixing inbalances between our chest and back. All these require a recruitment from our abdominals. Keep in mind, that many of us have weakness in the pelvic floor. I do suggest spending time working on strengthening that entire region which does include lower abdominals. Learn how to properly brace your core.
My point is, the more you spend time you spending on perfecting the large compound movements and building stronger function in your truck. Those abdominals will only continue to benefit. You don't need to spend time doing a 100 sit ups every day. You spine will also thank you. Too many sit ups and crunches causes to much spinal flexion that can lead to other postural discomforts.
Build a core that will actually serve you and improve your quality of movement.