5. Being stuck in the same routine
If you find yourself getting too comfortable with doing this or that exercise, you should change your routine a little bit. For example, you can try adding a yoga ball when doing crunches. A nice way to strengthen your core is planks. You can try to include some yoga or Pilates into your regular training routine. “Spicing up” your training routine will help your muscles strengthen more effectively.
6. Leaving your belly puffed out while doing crunches
Training your abs is a careful job. In order to keep your stomach flat and toned, you need to pull your belly in while doing your exercises. This way your muscle memory will get trained in the right way and as an added bonus your stomach size will decrease!