If one thing’s for certain, it’s that showing up to your next ClassPass booking wearing one of the best activewear brands will have you looking and feeling ready to take on your workout. So, we’ve been busy squatting, lunging, running, and sipping coffees around central London in bestsellers by the likes of Lululemon, Adanola and New Balance.

Our findings? Premium brands like Lululemon and Sweaty Betty are home to the very best leggings, while Adanola and FP Movement nail that minimalist, just-came-from-Pilates aesthetic. Elsewhere, Swiss brand On Running is hard to beat when it comes to performance-focused running trainers and apparel, while Gymshark and TALA have all bases covered when it comes to strength training.

Whether you’re gearing up for your first reformer class or you’re on the hunt for outdoor running gear that’ll see you through the coming winter months, we’ve got you covered with our edit of the best activewear brands of 2025.

Born in the Swiss Alps in 2010, On started as a running brand – focusing on creating trainers that would revolutionise the sensation of running. In the years since, they’ve branched out to offer an array of activewear, apparel, and accessories for other pursuits like court sports and gym training – but running is still very much their bread and butter.

Simple yet stylish, expect staple high-performance pieces that have been engineered to see you through everyday life, intense outdoor pursuits, and everything in-between. On our wishlist this season? The Women’s Studio Tights in the gorgeous new Grenadine colourway, and – in an ideal world – the seriously chic insulated Puffer Vest from the iconic Loewe X On collaboration.

Unless you’ve been living under a rock for the past, let’s say, three years, you’ll have spotted Adanola making many an appearance on your Instagram feed. Serving up a capsule wardrobe for your workout and leisure time, every single item in their (now extensive) collection matches the next. Their brunch-to-leg-day pieces are tonal – think chocolate browns, navy blues, and cherry reds – pushing us in the sartorial direction of a wardrobe filled entirely with clothes we’ll actually wear.

And they’re built for performance, too. Take the Ultimate Leggings, for example. They launched back in 2020 and have sold over one million units since, scoring highly in our squat and sweat tests. “I bought the Ultimate Leggings in Coffee Bean about two years ago, and they’re still my go-to pair for gym sessions and workout classes,” says GLAMOUR contributor, Georgia Lockstone. “I love that they’ve got no front seam – and the wide waistband stays firmly in place even when I’m on the treadmill.”

I will wax lyrical about Under Armour sports bras to anyone who will listen. Not only incredibly flattering, but they’re built for serious performance and make me feel confident and supported even in the bounciest of HIIT classes. (My favourite is the white, medium-support Infinity 2.0 Mid Sports Bra, which is seriously sweat-wicking, has breathable side panels and adjustable straps – but I’ve tried and loved many). You can shop by the support level you desire on their website, and there’s a plethora of colours and cuts available.

Outside of the realm of sports bras, Under Armour impressed us in so many categories: base layers, leggings, sports accessories and fleeces. You can shop by sport or by technology (CoolGear and HotGear are worth particular note), and delivery is super speedy.

New Balance needs little introduction – ICYMI, not just a destination for fashion trainers (the 530 hype lives on) but for actual sports gear, too. Among their bestsellers sit joggers, sweatshirts, long-sleeve running tops and gym leggings with pockets, where running gear is designed for performance – but stylish enough to wear to brunch. As we head into cosy season, I’m definitely bookmarking the Linear Heritage Fleece Full Zip, and a fresh pair of 9060 trainers. Just perfect for the colder weather.

The dark horse of the activewear world – particularly when it comes to yoga, pilates, and snowy winter pursuits – Free People’s activewear line injects feminine, bohemian influences into its sportswear. Countless pieces have garnered the influencer stamp of approval over the past year, including the cross-back Righteous Runsie (go to a London run club in the summer and you’ll spot it) – and their famously floaty and flirty running shorts.