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Peloton App
You don't have to have Peloton equipment to enjoy the app.
FitBit Coach
FitBit does a lot more than just activity trackers. This app will help you with workouts.
Shred App
Shred also has a community to help keep you accountable.
iFit App
You don't need iFit equipment to use the iFit app.
ASICS Studio
ASICS is known for their shoes, but their fitness app is amazing too!
Strava
If you are a running or a cyclist, you definitely need this app in your life.