What to Wear for HIIT Training: The Complete UK Guide

High-intensity interval training (HIIT) is one of the most effective workouts for burning calories, building fitness, and improving cardiovascular health. But wearing the wrong kit can hold you back. Here’s everything you need to know about choosing the right activewear for HIIT training in the UK.

What should I wear for HIIT training?

For HIIT workouts, you need activewear that handles explosive movements, high sweat output, and rapid direction changes. The essentials are: high-waisted squat-proof leggings, a high-support sports bra, a moisture-wicking top, and cross-training shoes with a flat, stable sole. Avoid loose or baggy clothing, as it can restrict movement and get caught during exercises like burpees and box jumps.

What are the best leggings for HIIT?

The best leggings for HIIT are high-waisted, squat-proof, and made from a nylon-spandex or polyester-spandex blend with four-way stretch. Key features to look for:

• Squat-proof fabric — remains opaque during deep squats and lunges
• High waistband — stays in place during burpees, box jumps, and jumping jacks
• Moisture-wicking — pulls sweat away from the skin to keep you dry during intense intervals
• Four-way stretch — allows full range of movement in all directions

Browse our Leggings Collection for high-waisted, seamless styles that hold up to high-intensity training.

What sports bra is best for high-impact HIIT?

For HIIT, you need a medium to high-support sports bra. Look for encapsulation or compression support, a wide underband for stability, and a racerback design for full shoulder mobility during overhead movements like thrusters and burpees. Moisture-wicking fabric is essential for managing sweat during intense intervals.

What shoes should I wear for HIIT workouts?

Cross-training shoes are the best choice for HIIT, not running shoes. Cross-trainers have a flatter, more stable sole that provides lateral support during side-to-side movements, and enough cushioning for jumping and landing. Running shoes have an elevated heel and soft midsole that reduce stability during the lateral and rotational movements common in HIIT.

Can I wear a gym set for HIIT training?

Yes. A matching gym set (leggings and sports bra) is ideal for HIIT. Look for sets made from performance fabrics with four-way stretch, squat-proof construction, and moisture-wicking properties. Our Fitness Gym Sets collection includes options suitable for high-intensity training, available from size S to 3XL.

How do I choose the right size for HIIT activewear?

For HIIT, fit is important: too loose and clothing can get in the way, too tight and it restricts movement. Use the size guides on each product page, which include bust, waist, and hip measurements in inches. If you’re between sizes, size up for leggings and stay true-to-size for sports bras. Our UK-based team is available via email or WhatsApp if you need sizing advice.

How often should you replace HIIT activewear?

Leggings and sports bras used for high-intensity training typically last 12 to 18 months with regular use. Replace them once the fabric loses its recovery, the waistband starts rolling, or a sports bra no longer feels supportive. Wash on a cool cycle and air dry to make them last longer.

Ready to kit up?

Shop the Leggings Collection and Fitness Gym Sets for HIIT-ready pieces, with fast UK delivery.