Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
In a word: badly
Not only would they fail to track as you're not taking any steps, you'd also risk breaking the fitbit as they're not waterproof
http://help.fitbit.com/articles/en_US/Help_article/Can-I-swim-or-shower-with-my-tracker/
Hi @Hrclemmer1231. These products are NOT waterproof. They should not be used while swimming. There is a hole in most of the devices for the altimeter. They should not even be worn in the shower. They can handle splashes like rain or sweat, that's it. The only one that's considered to be water resistant is the Flex and even that is not calibrated to register swimming correctly. Fitbit recommends that you register swimming as a manual activity.
MakMak | Community Council
If you find a response useful, please mark it as a solution to help others.
Check out the Lifestyle Forums for ways to get more active!
Best Answer