For any avid Instagram fashion follower (or, you know, anyone working from home), you'll know that tracksuits were the most popular outfit of choice in 2020 (according to Lyst in April global searches for joggers grew 123% compared to the same time last year) and it's a trend that shows no sign of slowing down as we enter a new year. But we're not talking any old school running gear, rather these are two-pieces in luxe fabrics and stylish colourways. Even designers have got in on the action, offering up their own premium interpretations on this workout classic.