Now we're going to move on. Last exercise, side squat. Take some good, deep breaths. Here we go. You're going to be back into the squat position, the ball up above. You're going to take it to each ...

Fitness experts reveal how often to train your core and the best core-sculpting exercises to tighten and tone your belly.

Think of a small, squashy ball that you can place under your sacrum (the bone at the bottom of your spine) when doing bicycle crunches, between your thighs for an inner thigh burn, or hold in your ...