TrainingPeaks is a free app that helps endurance athletes keep track of their workouts and reach their goals. It's an ideal app for any athlete who wants to get fitter, stronger, and healthier.

The app has a vast amount of free content, including:

Over 100 popular fitness apps and devices, including Apple Health.
Free workouts for every level, from beginners to advanced athletes.
A wide variety of training modes.
Detailed information about your progress.
A customized workout plan for you based on your goals and fitness level.
Custom your workout plans to help you reach your goals.
A vast amount of free content for you to read, view, and listen to.

If you choose to purchase a Premium subscription, you'll be charged $19.99 for one month and $124.99 for one year.