1. Aaptiv (best for comprehensive training) Aaptiv is an in-ear personal trainer that'll take your workouts up a notch, no matter where you decide to knock them out. The app features more than 2,500 audio classes, with 15 trainers creating new ones each week.
Are you only focused on running? These are our picks for the best running apps available that you can match up with one the best fitness trackers. And if you're .