Aerie sports bra

This moisture-wicking, padded Spandex bra has an all-mesh racerback for added breathability.

$30; aerie.com
Sugoi Wide-Band sports bra

A 1.5"-wide elastic band under the bust keeps this lightly supportive bra in place, and the soft lining is all comfort.

$47 with code OPRAH2009; sugoi.com
Lululemon Athletica sports bra

C cup or bigger? Here's your bra: padded straps, hook-and-eye closures, and wicking fabric between the cups.

Lululemon Athletica, $58; lululemon.com
Calvin Klein Performance tank top

A snug, ribbed tank with a shelf bra is ideal for yoga or Pilates.

Calvin Klein Performance, $36, Lord & Taylor; 800-223-7440
Cheryl Burke by Fit Couture V-neck tank top

Take this V-neck tank—designed by a Dancing with the Stars champion— to salsa class.

Cheryl Burke by Fit Couture, $47 with code OPRAH; fitcouture.com
Splits59 tank top

Nylon and Lycra help this sleek, ultrasoft tank top retain its shape.

$78, free shipping with code OPRAH; splits59.com
Nike V-Neck T-Shirt

Replace an oversize tee with this flattering, bright V-neck (its seams run down the back, not the sides, for a more feminine fit).

$25; nike.com
Saucony SPF 50 T-Shirt

This incredibly lightweight long-sleeved tee protects skin with SPF 50—perfect for a run on a sunny day.

$38; saucony.com
Icebreaker wool T-shirt

You'd never guess that this soft, thin tee is made of wool—warm, non-itchy merino wool.

$56; icebreaker.com/oprah

Next: Sporty fitness skirts with built-in shorts