What are some alternatives?
When comparing Centr and Freeletics, you can also consider the following products
Fitbod - Personalized Strength-Training powered by Machine Learning
Freeletics Training Journeys - Focused, personalized journeys to reach your fitness goal
Strava - Strava is one of the benchmark apps on the market in the fitness category, and perhaps its only real downside is that there are some concerns with the safety of the software.
Gymspiration Bot - Random gym exercises in a gif for every muscle group
Endomondo - Get the most out of your runs, walks, rides, and more with our top rated fitness tracker and personal training app. With Endomondo, you can track all of your workouts using GPS, check your stats, and reach your fitness goals.
Fit Gurus - No fluff, just serious training. Workouts from top trainers.