So, if you're trying to run a certain distance at a certain pace, such as when you're running interval sessions, if you have an Apple Watch on your left wrist then you would probably want to wear a Garmin, Suunto, TomTom or Polar watch on your right.
And, because it's not waterproof, there is a range of sports that many people do to stay fit where they cannot wear an Apple Watch, with swimming and triathlon just being two.
Kuo predicts Apple will release an upgrade to the original model that will have a faster processor plus a sports model with GPS and barometer features plus improved waterproofing.
The new Sport model, Kuo says in his report, will also have a bigger battery to power the GPS features.
Kuo has a good track record for predicting new Apple products but nothing is confirmed with Apple until it is released.
There have been no announcements but Apple is expected to unveil changes to the Apple Watch alongside the iPhone 7 in early September.