If you want flat, toned abs asap you're going to love this 30 Day Plank Challenge. I've always been a fan of planks for training abs and core strength. Planks are challenging, effective, and really help tighten and tone the tummy quickly. No equipment or crunches are required. There are different ways to perform a plank to boost the calorie burn and engage more muscles so you can get a strong, tighter, toned core. That's why I put together this 30-day plank challenge for you! It has different types of planks that will tone your tummy. If your stomach feels more