Nike Training Club
Designed specifically for women, this app provides more than 85 instructor-narrated fitness routines—basically it's an audio-only exercise video you can play from your phone. It tracks your progress and rewards efforts with custom workouts created by Nike’s professionals, pro athletes and celebrities such as Glee star Lea Michele, Olympic gymnast Shawn Johnson, and personal trainer Ary Nunez, who trains Rihanna. Create playlists to go along with your workouts, and, if ever you don't understand what the instructor is talking about, you can click into a video demonstration for each move. Available for iPhone only.
Download: Nike Training Club, Free