Despite the bad rap of the Stravassoles, super-popular Strava has a load of features. Still the most popular workout app. While most are happy to use the free version, Strava's Premium subscription has always been available, and unlocks a wealth of data. Premium has now been replaced by Strava Summit, which allows you to choose from a variety of different packages. These allow you to adapt the data you want to pull out, and adapt what you want to pay for. Training Pack is for training data, plans etc. Analysis Pack pulls power data, overlapping Training Pack to some extent. Safety Pack works with a beacon for emergency alerts, and a heat map of your routes.