Psst: it's not another plank.

If you suffer from a bad back, you know just how frustrating it can be to do everyday tasks, including workouts and especially ab exercises. That's because your core and your back are closely linked.

If you are someone who is looking to work on their ab muscles and build their core strength, your go-to exercises may involve sit-ups or crunches. However, there are other exercises you can try that ...