In a year marked by lockdown orders and canceled gym memberships, sales of fitness products in the U.S. have skyrocketed. Some of 2020's products pack incredible features, like a bike helmet with automatic turning signals, and a smartwatch that measures your blood oxygen saturation. Other products? Not so impressive. Whether you're looking to get back in the gym or exercise from home, make smart (even surprisingly cheap) purchases by checking out 11 of the best and worst fitness products from 2020.