Not made for what it was created for.
In addition to not being perfectly waterproof at less than 5ATM, because the protective plate of the ECG sensor (electro-cardiogram) comes off, yes I say, it comes off (in less than a year) ...
I'm not sure if this is a good idea, but I'm sure it's a good idea.
If you want a nice watch and pretend to be sporty, go for it, if you are, go for something else.
I'm going to go for real watches, really waterproof, like Casio G-Shock or equivalent.