Amazon Blueprints - Create your own Alexa Skill in minutes
Train Fitness - Automatically track your workout at the gym - hands free!
Reverb - Use Alexa on your Mac, iPhone and Android
MoovBuddy - An exercise app for back & neck pain and joint health
Lexi - Speak to Alexa through your iPhone
Apple Fitness+ - Apple Fitness+ offers 12 different workout types and new workouts and meditations every week, from 5 to 45 minutes.