MoovBuddy - An exercise app for back & neck pain and joint health
RocketBody - The First ECG Sports App for Apple Watch
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Running Assistant - Voice controlled virtual running assistant
gymConsole - Workout tracker for hackers. Log everything the way you want
Runtastic - Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.