8 free fitness apps that can help you get in shape — and what they’re best for

4. The fourth-best overall app was one of the highest-rated strength-training apps: Fitness Buddy

What it is: The free version of the app, which was formerly called Fitness Buddy Free, offers a range of workouts that can be done at home or in a gym using weights, a kettlebell, or a resistance band.

Best for: Strength training. This is an app best used for strengthening work, though there are a couple of cardio and flexibility options. (Some flexibility exercises may have been added after the study reviewers did their work, so were not factored into the score.) You can also build custom workouts using a variety of exercises.

Relevant scores: 8.1 out of 30 for aerobic fitness, 22.9 out of 30 for strength training.

5. The best strength-training app: StrongLifts 5×5

What it is: StrongLifts 5×5 is a specific, straightforward weight-training program based on five types of lifts: the squat, bench press, deadlift, overhead press, and barbell row. The program involves three workouts a week, with participants gradually increasing the amount of weight they can lift.

Best for: Strength training, especially weight lifting. This is an excellent training program for people looking to get started with lifting, since it includes a series of exercises that serve as an excellent foundation for strength.

There is also a premium version that includes additional exercises and warm-ups, but the basic training program is free and effective.

Relevant scores: 24 out of 30 for strength training.

6. The third-highest rated strength-training app was also the top flexibility app: FitnessBuilder

What it is: Fitness Builder offers a variety of free, multi-week training plans (there’s also an optional paid subscription). Free plans include over 400 workouts that can be solely body-weight based, rely on gym equipment, or fall somewhere in between.

Best for: A strength- and flexibility-focused workout program. With a wide variety of plans, you can work through training programs focused on strength, movement, fat loss, and much more.

Relevant scores: 21.2 out of 30 for strength training; 7.1 out of 10 for flexibility.