Why do I get steps when using weights?

[hik2chat]

I found some 1 pound weights in my house. I thought I would add some arm work when I was watching tv. But my Fitbit was adding steps? Can you tell me why? 

Moderator Edit: Clarified Subject.

[MarcoGFitbit]

Hello @hik2chat, thanks for joining the Fitbit Community, it's great to have you on board. 

Thanks for bringing this situation to my attention. Please note that Fitbit devices have a finely tuned algorithm for step counting. The algorithm is designed to look for motion patterns that are most indicative of people walking. The algorithm determines whether a motion's size is large enough by setting a threshold. If the motion and its subsequent acceleration measurement meet the threshold, the motion will be counted as a step. If the threshold is not met, the motion won’t be counted as a step.

Other factors can create enough acceleration to meet our threshold and cause some over counting of steps, such as riding on a bumpy road or moving your arms when lifting weights. Our engineers have worked diligently on your tracker's algorithms to make sure that it does not pick up false steps or activity recordings However, if you do pick up some steps when exercising with weights, see How do I delete data? for instructions on removing steps.

I hope this can be helpful, if there's anything else I can do for you, please feel free to reply.