ANSWERED
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
It's great to see you around @RaynerRobinson and @WendyB thanks for stopping by.
Keep in mind that your Blaze will detect your steps depending on the arm movement. If you are on a treadmill and you are holding the bars, your steps won't be detected since there isn't arm movement. You can take a look at the link that our friend provided and if you really want to track your steps while being on the treadmill, you can place the tracker inside a pocket in the meantime.
Let me know if you need anything else. 
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
It needs to see the arms swinging.
Also See this thread by @MrMarv
It explains it very well
https://community.fitbit.com/t5/Alta-HR/Step-calculation/m-p/2586363/highlight/true#M22198
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
It's great to see you around @RaynerRobinson and @WendyB thanks for stopping by.
Keep in mind that your Blaze will detect your steps depending on the arm movement. If you are on a treadmill and you are holding the bars, your steps won't be detected since there isn't arm movement. You can take a look at the link that our friend provided and if you really want to track your steps while being on the treadmill, you can place the tracker inside a pocket in the meantime.
Let me know if you need anything else.
Best Answer
Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Those are great news @RaynerRobinson, I am glad to hear that the recommendation provided worked. If you need anything else, do not hesitate to post it.
Keep the stepping up! 
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