"Over the last three months, I have been living in athleisure (this is no exaggeration). For summer, I wanted to wear something that would elevate my daily leggings uniform into something a little more chic. I've been loving the super comfy Athleta Trekkie North Jogger ($89). I have the black pair, and they look great with white sneakers and a plain white T-shirt." — Christina Stiehl, senior editor, Fitness