Apple Fitness is designed for Apple Watch users. If you don’t have an Apple Watch, you can use the app a little bit … a little bit. But not really, here’s why.
Apple Fitness + requires an Apple Watch to sign up
To sign up for Apple Fitness +, you need an Apple Watch paired with your iPhone. It̵
You don’t need an Apple Watch to start a workout
If your Apple Watch battery is dead, left at your parents’ house, or otherwise unplugged, you’ll see a pop-up explaining when you start exercising on your iPhone or iPad (but not on an Apple TV). without it, you cannot see your heart rate and calorie burn on the screen.
Tap “Work Out Without Watch” to start the workout anyway.
Note: Any workout you do without an Apple Watch will not count toward closing your activity rings, as no recorded calories are burned.
Fitness + is designed for the Apple Watch
Fitness + is clearly not really designed for use without an Apple Watch. It keeps track of your exercise statistics and displays them on the screen. This makes it easy to check your heart rate, for example. You can see how your effort compares to that of other people in the same workout. Apple Fitness is all about this integration.
But if you don’t have your Apple Watch with you and you want to get into a workout, Apple Fitness + won’t stop you from sweating.
If you don’t have an Apple Watch and you want to get started with Apple Fitness +, consider buying an Apple Watch. You can get an Apple Watch Series 3 for less than $ 200, and it works with Apple Fitness +
In theory, if you really want to sign up to Fitness + but don’t have an Apple Watch, you can borrow one, pair it with your iPhone, sign in, reset the watch, and return it. That seems like a lot of work, though, so you can pay Apple $ 10 / month for workout videos without the extra features.