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

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Getting in shape can change your life.

Regular exercise is the closest thing to a miracle drug that we have. It can improve your physical health, fight disease, extend your life, boost your mood and memory, combat anxiety and depression, and more. Plus, it just feels good to be fit.

If you don't already have an established exercise routine, it's hard to go from intending to work out to actually getting it done. That could be one reason why more than 75% of Americans don't get enough exercise.

If you're trying to figure out how to start a fitness routine or looking to track your fitness journey, apps can help.

No single app is perfect, but depending on your goals, free fitness apps can help you build strength, get better at running, and improve your stretching or recovery.

For a study published in the Journal of Medical Internet Research in 2017, a team of researchers analyzed how well 28 different fitness apps matched the exercise guidelines of the American College of Sports Medicine (ACSM). The 28 apps were chosen because they'd been reviewed before in a previous study on fitness apps, and were selected from the more than 100,000 health- and fitness- apps available.

In general, the government's recommended physical activity guidelines call for healthy adults to do at least two and a half hours of moderate-intensity activity — or 75 minutes of vigorous-intensity activity — per week, along with muscle-strengthening exercises at least twice a week.

The ACSM takes guidelines for exercise programs a few steps further, stating that all workout programs should include safety precautions, warm-up, conditioning that includes strengthening, and cool-down. Plus, they say programs should progress at a safe rate for each individual, and that workout programs should include components of aerobic fitness, strength and resistance exercise, and flexibility.

A comprehensive program that does all of that is a lot for any app — many apps don't include full safety precautions, warm-ups and cool-downs, or all the details that a novice might want to know. Plus, most apps focus on one aspect of fitness, like getting stronger or building running endurance.

That's why no app in the study scored more than 35 points out of 70 in the evaluation scale that the researchers devised. (Apps could receive 30 points for aerobic fitness guidelines, 30 points for strength and conditioning guidelines, and 10 points for flexibility guidelines.) 

But a few of the top-scoring apps can serve as a good guide to overall workouts or for more targeted goals like building aerobic endurance, strength, or flexibility. All these apps guide users through exercises, offering videos that show how to perform moves and voice guidance to signal when it's time to change pace or position.

Here are the best choices, according to the research.

SEE ALSO: How much you have to exercise and what kind of workout to do to get different types of benefits

Best overall score: The Johnson & Johnson Official 7-Minute Workout

What it is: The Johnson & Johnson Official 7-Minute Workout app was designed by Chris Jordan, Director of Exercise Physiology at the Johnson & Johnson Human Performance Institute. It's designed to meet the American College of Sports Medicine's fitness guidelines, and includes both aerobic and strength-training exercises done in the style of a quick, fitness-building interval program.

Best for: Beginners. This app ranks very highly on safety, making it a great choice for beginners. It provides an effective full-body workout that can help people meet fitness guidelines, but doesn't particularly excel in any one area. So anyone seeking a more specialized, less general program may want to look elsewhere.

Relevant scores: 16.3 out of 30 for aerobic training; 17.2 out of 30 for strength training



Second highest overall: Nike+ Training Club

What it is: The Nike+ Training Club app includes more than 100 workouts designed by Nike trainers, with video and audio guidance for workouts of different lengths. You can also log your other fitness activities on the app.

Best for: Full-body strength training. This app doesn't perform as well in the aerobic exercise portion (Nike has another app exclusively for running which is worth checking out). But it did well in the strength section. Reviewers noted that both the individual workouts and the multi-week training programs were good.

Nike+ is great for tracking overall fitness and offers good strength-training options. This app is a promising choice if you want a varied selection of workouts using anything from simple body-weight exercises to gym equipment. And unlike most apps, there's no pressure to upgrade to a premium program.

Relevant scores: 10 out of 30 for aerobic training; 19.5 out of 30 for strength training; 3.1 out of 10 for flexibility



The app with the third-best overall score was the only aerobic fitness app that scored highly: Weight Loss Running by Verv

What it is: This app was named Running for Weight Loss: Interval Training when it was reviewed for the study, but that's since changed. It's specifically focused on interval training, with runs that alternate between easier and harder levels of intensity. There's also a meal-planning component, which is important for weight loss.

Best for:  Aerobic training and running. This app is targeted towards people who want to lose weight, but it'll also help you build endurance and speed as a runner. Interval training is one of the best ways to get in shape, so no matter what your aerobic fitness goals are, plans that incorporate this approach are worth considering.

The app also includes training programs for specific runs: one helps you prepare for a 5k within seven weeks, and another is a 16-week marathon training program (which assumes you already run a fair amount). Another program is designed for those just starting to run.

To get to the free version, you need to sign up for a free premium trial and cancel the auto-renew. Some users report that the pop-ups asking you to sign up for a paid membership are intrusive.

Relevant scores: 26.7 out of 30 for aerobic training; 3.5 out of 10 for flexibility



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