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Re:A year after launch, it’s now clear that pretty much no o... by k-mcgrady on Sunday April 10, 2016 @04:12PM (#11467937)
It's splash and water resistant (not proof) so the sweat isn't an issue. They have a support page detailing the water resistance that might be useful for you: https://support.apple.com/en-gb/HT205000
Re:A year after launch, it’s now clear that pretty much no o... by MBCook on Sunday April 10, 2016 @04:50PM (#11468114)
There are reports that it can handle water MUCH better than that. Showers, swimming, etc.

But Apple doesn't promise it and it would void your warranty. It's a question of if you're willing to risk $400+ on people's anecdotes or not.