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    1. Health and Fitness
    2. Fitness

    I’m Updating My Workout Wardrobe This Month – and Can’t Get Enough of These Summer Activewear Trends

    Start summer sweat sessions in style.

    Amelia Yeomans's avatar
    By Amelia Yeomans
    Published 12 June 2025 In Buying Guides

    When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

    models in summer activewear trend pieces from Adanola/lululemon/adidas/Free People/Oner
    (Image credit: Adanola/lululemon/adidas/Free People/Oner)
    Jump to category:
    • Contrast detailing
    • Unitards
    • Slogan / spellout tees
    • Butter yellow
    • Capri leggings
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    I am a firm believer in the power of a good exercise outfit. When it feels like nothing else can pull you out of a slump, a vibrant pair of leggings and a comfortable sports bra can work surprisingly well to get you ready for a sweat session - which is why I'm paying close attention to summer activewear trends that will bring some fun to my fit kit.

    I typically approach trends with caution, avoiding purchasing anything that won't stand the test of time and get plenty of wear. However, the beauty of activewear trends is their functionality. Very few pieces are noticeably 'trendy' and instead play into subtle style moments that you can wear on repeat.

    I'm not one to encourage overconsumption or refreshing your wardrobe for the sake of it, but if a new exercise set is the thing to get you enthusiastic about moving your body, it's a no-brainer investment in my eyes.

    I spend a lot of time looking at what's trending, and I have noticed several common themes. Athleisure is certainly leaning into the retro feel this summer, with graphic tees and cropped leggings conjuring images of 80s workout classes - but there are also timeless one pieces and pastel colour palettes to experiment with if that's more your speed.

    As well as rounding up this season's trendiest pieces that you will wear throughout this summer and beyond, I've also stuck to brands the MC UK team have tried and tested, and can confirm are worth the investment. From the micro shorts and the best workout camis to spring workout sets and the best gym layers, these are the modern yet timeless summer activewear trends I'll be shopping.

    Summer activewear trends: Quick shopping links

    • Contrast detailing top: £35 at adidas
    • Unitard: £48 at Adanola
    • Slogan tee: £38 at Oner Active
    • Butter yellow shorts: £44 at Free People
    • Capri leggings: £78 at lululemon

    Contrast detailing

    Heritage Tank Top With Integrated Low-Support Bra adidas

    (Image credit: adidas)

    adidas Heritage Tank Top With Integrated Low-Support Bra

    Today's Best Deals
    £35 at adidas

    Reasons to buy

    +
    Three different colourways
    +
    Built-in bra
    +
    Retro feel

    Reasons to avoid

    -
    Only low support

    Contrast piping is cropping up everywhere in the athleisure world right now, and it's one of my favourite subtle yet chic trends that you may already have in your wardrobe. The pop of white elevates this beyond a basic cami and adds a retro feel. I love a workout top with built-in support, which this one offers, and it's the ideal length for pairing with high-waisted bottoms. It's also made with CLIMACOOL fabric that wicks sweat, making it ideal for summer workouts.

    Unitards

    adanola Ultimate Racer Cut Out Romper - Navy Blue

    (Image credit: Adanola)

    Adanola Ultimate Racer Cut Out Romper

    Today's Best Deals
    £48 at Adanola

    Reasons to buy

    +
    Very comfortable
    +
    Instantly put together
    +
    Cool

    Reasons to avoid

    -
    Not the most convenient piece

    I wear my Adanola unitard constantly, and they're definitely having a moment this summer. Another vintage style that's coming back into fashion, a unitard is extremely easy to throw on and it looks instantly chic and put together with minimal effort - ideal when you're rushing to an exercise class. This design offers 4-way stretch, sweat-wicking material, and moulded cups for medium support. I find my unitard to be supportive enough for Reformer classes and hikes without a sports bra, which is another plus when you want to keep your kit simple.

    Slogan / spellout tees

    Oner Graphic Washed T-Shirt

    (Image credit: Oner Active)

    Oner Active Graphic Washed T-Shirt

    Today's Best Deals
    £38 at Oner Active

    Reasons to buy

    +
    Comfy, oversized fit
    +
    Great gym layer
    +
    Can be worn casually

    Reasons to avoid

    -
    Baggy fit may get in the way

    Oner Active's gym layers are some of Team MC UK's favourites. They're affordable, extremely comfortable, and high quality - a winning combination. Slogan tees are back in a big way in the fashion world, which means the style is creeping into athleisure too. If you can't find a slogan you like, a vintage spell-out like this is a brilliant way to get the look without limiting wearability. Plus, you can pair it with jeans or shorts all summer to really make it a worthwhile investment.

    Butter yellow

    free people Tempo Light as Air Run Shorts

    (Image credit: Free People)

    Free People Tempo Light as Air Run Shorts

    Today's Best Deals
    £44 at Free People

    Reasons to buy

    +
    Editor favourite
    +
    Great for running
    +
    Lightweight

    Reasons to avoid

    -
    May be too short for some

    You've probably already seen butter yellow athleisure everywhere, but the trend isn't disappearing any time soon. The beauty of this shade is that it's bright without being too vivid or loud, so it adds a subtle pop of colour that can easily be toned down with white pieces. And yes, it really suits every skintone. These Free People shorts are a firm favourite of our Health Ed Ally, and they're brilliant for running in warmer weather thanks to the high-compression breathable mesh lining, and it has a handy zip pocket so you're not bogged down with a bum bag either.

    Capri leggings

    lululemon Align™ High-Rise Crop 17"

    (Image credit: lululemon)

    lululemon Align™ High-Rise Crop 17"

    Today's Best Deals
    £78 at lululemon

    Reasons to buy

    +
    High quality
    +
    Range of colours
    +
    Buttery soft

    Reasons to avoid

    -
    Not to everyone's taste

    Capris are certainly one of this season's most divisive trends, but I'm all for it. They instantly elevate any outfit without compromising on wearability, which is why these lululemon leggings get my vote if you want to play into the look. We know and love the Align leggings for their high quality and buttery fabric, so you know you're making a good investment here. Showing a little more leg is not only comfortable in warmer weather, but it makes your outfit far more interesting due to the varied silhouettes. You can also style these up with some flip flops and a baby tee, or a matching sports bra for Pilates.

    Chelsea Peers jumper

    Chelsea Peers Slogan Jumper
    £50 AT CHELSEA PEERS

    Free People Carpe Diem running shorts

    Free People Carpe Diem Shorts
    £38 AT FREE PEOPLE

    Monday Body tank top

    Monday Body Zion Tank
    £66 AT MONDAY BODY

    LSKD belt

    LSKD Running Belt
    £45 AT LSKD

    Damson Madder socks

    Damson Madder socks
    £12.00 AT DAMSON MADDER

    Adanola running tee graphic print

    Adanola Distance Short Sleeve Tee
    £38 AT ADANOLA

    Tala bra

    DayFlex Ruched Strap Bandeau Sports Bra - Burgundy
    £42 AT TALA

    Free People bag

    Quilted Carryall Bag
    £68 AT FREE PEOPLE

    Wellness gifts: Alo Yoga

    Women's Chargefeel 3 Workout Shoe
    £34 AT ALO YOGA

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    workout kit
    Marie Claire Newsletter

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    Amelia Yeomans
    Amelia Yeomans
    Junior Shopping Editor

    Amelia is Junior Shopping Editor at Marie Claire UK. With a keen eye for lifestyle trends and a focus on quality over quantity, she is very clued up on the best products and brands on the market. She previously worked as a Senior Writer for woman&home, covering everything from product reviews and nail art trends to reporting on fashion weeks and the best-dressed celebrities at red carpet events.

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