I've seen people pacing back and forth during davening.
a) Is this a problem because of makom kevuah? b) What the halachic parameters of having a makom kevuah?
Should one be in set place when he's davening?
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The Rebbe Rashab in Kuntres Hatefila says clearly not to walk around during davening, and says that even if someone claims it helps them concentrate, they're wrong, it distracts them. I don't have an answer to part 1 of your question. ( https://judaism.meta.stackexchange.com/a/2155/6886)