Alternative fitness tracking for secure environment

I’m an owner of an Apple Watch and have a great use for it. However my workplace (which is a secure environment) doesn’t allow my iPhone or watch to be taken in. As result lots of steps and calorie count is missed. Does anyone else have similar situation where they’ve used an alternative fitness tracker compatible with iPhone that would fill the data on the health app whilst I’m unable to use the Apple Watch?

the conditions are it must not have WiFi receiving or camera but Bluetooth is fine.

Thank you in advance.