I use the fitbit, which has an API: http://dev.fitbit.com/
The fitbit Flex is a wristband, which seems to be a popular form factor recently. I prefer the fitbit One, which is a small clip that you can clip onto your pocket/waistband/bra/etc.
I use the fitbit, which has an API: http://dev.fitbit.com/
The fitbit Flex is a wristband, which seems to be a popular form factor recently. I prefer the fitbit One, which is a small clip that you can clip onto your pocket/waistband/bra/etc.