What's the best iOS app for tracking running, cycling, and walking activities, sharing progress with friends, and participating in fitness challenges?

Strava: Run, Bike, Walk is an excellent iOS application for individuals passionate about tracking their running, cycling, and walking endeavors. It provides comprehensive activity tracking using your iPhone's GPS, allowing you to monitor pace, distance, elevation, and calories burned. The app allows you to easily share your workouts with friends, creating a supportive community where you can give kudos and comment on each other's achievements. Strava also offers a platform to participate in various fitness challenges, providing extra motivation and a sense of accomplishment. You can join monthly distance challenges or segment challenges to compete with other athletes on specific sections of roads or trails. To get started, simply download the app, create an account, and begin recording your activities. The app also integrates with various wearable devices for seamless data syncing. With its user-friendly interface and social features, Strava is a powerful tool for enhancing your fitness journey.