Pilates has taught us that you don't need to invest in expensive equipment to get a great core workout at home. But one simple tool — the humble Pilates ball — may be worth grabbing anyway. A Pilates ...

Now, before you go grabbing that pump, you’re going to want to make sure you have the right ball size on hand. To do that, all you need to know is your height. If you’re 5’5” or shorter, stick to a 55 ...