We all know how difficult it is to motivate yourself to lose weight. Contrary to what you might expect, it's rare that people live up to those New Year's resolutions they made three months ago. One solution that makes sense: A fitness app, which can help you track your steps, try new workouts, and share your progress with others.

The only problem: figuring out which app works best for you. With dozens upon dozens of fitness apps on both iOS and Android, the options can seem overwhelming—and it's hard to tell which apps actually provide helpful advice and stats. That's why we rounded up 15 apps (both new and old) that we think you should give a try.

We broke down our picks into six categories:

  1. Comprehensive trainers, which offer a full suite of exercises for various goals;
  2. Quick-hit apps, which focus on shorter workouts for maximum impact;
  3. "Get out of the gym" apps, for runners and cyclists who hit the dusty trail;
  4. "Get off the couch" apps, designed to help people go from zero to, well, okay;
  5. "De-stressing" apps, designed to help your mind recover;
  6. A music app that is designed with your workouts in mind.

A few notes about our methodology:

  • This roundup only includes apps that are specifically designed for fitness, which is why it's missing popular apps like Spotify and Apple Music (which are great for workout playlists, but aren't really fitness-centric).
  • We also excluded apps that are designed to be used with fitness trackers, as the FitBit and Withings apps don't really help unless you have their devices.

Here's our roundup of the best health and fitness apps of 2017.