Become an ACE
Ace Tennis for Apple Watch is a simple, yet powerful app that can help improve the power and timing of your tennis serve. Ace shows you the force you exert during your swing - so you can fine-tune it to make the biggest impact when it counts.
Now with Siri support, simply say "Hey Siri, start serving with Ace Tennis" and youre ready to go.
Ace Tennis also integrates with HealthKit allowing you to track the calories burned while using the app, and save the workout information to the iOS Health App