(Image credit: Shutterstock) Over the years, I've tried so many of the best core exercises that it's hard to keep track of all of them. But there are a few I'd recommend starting with that are simple, effective and beginner-friendly. They've stuck around in my mind, so that says something. While the likes of crunches and sit-ups target the more superficial core muscles, you also should think about strengthening your deeper, stabilizer muscles that support your spine and pelvis to build true strength that keeps you injury-free. If you’re a complete beginner, pregnant or postpartum, or currently working with an injury, it’s always best to seek personalized advice from a qualified professional. What are the exercises? The exercises below are equipment-free, but I do recommend one of the best yoga mats to support your body. Here's each move and how to do it. Aim for 3-4 sets of 8-12 reps per side per move with no more than 20 seconds rest between exercises and 30-60 seconds between sets. 1.…