The past few years have been a time of unprecedented growth for workout apps. In 2020, fitness-app downloads shot up by 46 percent, and daily user numbers increased by 24 percent, according to Polaris ...

Sure, you can go to the gym or hit the pavement to break a sweat, but if you want to see any real progress, you need a fitness plan. The problem? With thousands of workouts at your fingertips, ...