Some people are happy working out in old t-shirts and sweatpants. I am not one of those people. I prefer colourful designs that are fun to wear and that stand out at the gym. Fun activewear designs can be hard to find in plus size (if there are any entrepreneurial types reading this, we need more plus-size activewear brands on the market!) Luckily, I’ve uncovered more than 20 brands and boutiques where you can find what you need to get your sweat on. Enjoy your workout! Adidas Adidas carries fairly basic designs sporting their signature logo. You can buy Adidas directly online, but you can also often find it at…