Let’s be honest: These days, airplanes can barely fit your own two legs. Given the limited real estate that comes with an economy class seat, you can expect to sit for hours with a stiff neck and back, which takes a serious toll on your circulation. While most people know that standing up and walking around during your flight can boost your blood flow, it’s not always possible (or convenient!) to do so. That’s where a tennis ball comes in. More >>