If you buy the Apple Watch 2 or 3 (Apple Watch Series 2 and Series 3) you can now go swimming with your Apple Watch. The new model is waterproof up to 50 meters thanks to an upgraded sealed design.
With this new Apple Watch, you can swim, run in the rain, run a Tough Mudder and more without worrying about your Apple Watch. This works in fresh water, in pools, and in the ocean.
This is very handy for users who don't want to take the iPhone near the pool or into the pool, but want to stay connected. The iPhone 7 is water resistant, but not to the same level as the Apple Watch Series 2 and Series 3.
The Apple Watch and Apple Watch Series 1 are not waterproof to this level, so don't try this with those models.