A processing device receive a two dimensional (2D) video recording of a subject user performing a physical activity and provides a three dimensional (3D) visualization comprising a virtual avatar performing the physical activity. The processing device causes display of the 3D visualization comprising the virtual avatar at a first key point in performing the physical activity, receives first user input to advance the 2D video recording to a first position corresponding the first key point, and receives second user input comprising a first synchronization command. In response, the processing device generates a first synchronization marker to indicate the first position in the 2D video recording corresponding to the first key point.
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