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Recent WiFi standards use Channel State Information (CSI) feedback for better MIMO and rate adaptation. CSI provides detailed information about current channel conditions for different subcarriers and spatial streams. In this paper, we show that CSI feedback from a client to the AP can be used to recognize different fine-grained motions of the client. We find that CSI can not only identify if the client is in motion or not, but also classify different types of motions. To this end, we proposedoi:10.1145/2643614.2643620 dblp:conf/mobicom/ZengPXM14 fatcat:af2nrfhb3bac3lv2354tqxxe24