IPhone4, iphone 4 and iPhone5
Although there is no coprocessor system to support the class model, it can be directly recorded and displayed by some third-party applications, which is better than nike+ and runkeeper.
app; application
shop
Load some third-party health applications for use.
iPhone
Add a transmitter to calculate walking or running.
dislodge
iPhone
It is better to use some extra accessories than apples.
look
Watch and iPhone
Perfect combination