Cost: seven-day free trial; subscribe for $15 per month or $100 per year
Available for: iOS, Android
Aaptiv is an audio-only gym-workout app that guides you through classes as if an instructor is right in your ear. It's like you're in a group class or streaming a workout video, but only getting the audio — making it a great gym-workout app that you can use whether you're on a treadmill or in the weight room. They have 2,500+ trainer-led, music-driven workouts and add more than 30 classes per week across many workout modalities including elliptical, cycling, stretching, and yoga. Aaptiv also offers complete training programs to help you reach your goals, as well as half-marathon, 10K, and 5K training plans. Working out outside or without WiFi? You can download classes to play offline.