Quick answer

Start with a breathable tank and supportive bottoms, then add layers and accessories that match your workout intensity.

Why a matching set makes gym mornings easier

A coordinated gym outfit set removes the mental load of pairing separate pieces. When your tank and shorts or training bra and thong are designed to work together, you spend less time deciding and more time moving. Underdays' Training Set, for example, includes a tank top style piece that can be layered or worn alone, so you get flexibility in one purchase.

Trade-off: sets vs. mix-and-match

A matching activewear set gives you a polished look and often a better price than buying pieces separately. The downside is that you're locked into one color or style. If you prefer variety, you might mix a solid tank from one set with bottoms from another. For most gym-goers, though, a set simplifies packing and ensures everything fits together.

Steps to build your training set

  1. Pick a breathable top: Choose a tank or training bra that wicks moisture and allows full range of motion. Look for styles that can be worn alone or layered. A common mistake is choosing a cotton top that holds sweat—stick with performance fabrics.
  2. Choose supportive bottoms: Select shorts, leggings, or a workout thong that stays in place during movement. Check the waistband and seam placement to avoid chafing. If bottoms ride up or dig in, try a different size or style.
  3. Add a layering piece: Include a lightweight jacket or long-sleeve top for warm-ups or cool-downs. This extends the set's use beyond the gym floor. Don't forget to test the layer over your tank to ensure it doesn't restrict movement.
  4. Accessorize for function: Add a gym bag, water bottle, and hair ties that match your set or complement its color. Keep accessories minimal to avoid bulk. Over-accessorizing can weigh you down—stick to essentials.
  5. Test the set in action: Wear the full set during a workout to check fit, comfort, and durability. Pay attention to how each piece behaves during your main exercises. If something shifts or irritates, adjust your choices before committing to the set for regular use.

Product highlights

  • The Training Set: The Training Set from Underdays is a high-value set designed to support your workout wardrobe, available in sizes XS through XL. You get a coordinated look without hunting for separate pieces, and the size range helps you find your fit.

    The Training Set

    The Training Set