1. A computer-implemented method comprising: providing instructions to a user to perform an athletic movement; monitoring with at least a first sensor the user performing the athletic movement; generating a virtual avatar of the user during the user's performance of the athletic movement, the avatar having a first contiguous area shaped like a first human subject, wherein the first contiguous area comprises a plurality of appendage-like sub-areas representing appendages of the first human subject; displaying on a display device the virtual avatar overlaid relative to a virtual shadow, wherein the virtual shadow comprises a second contiguous area that is larger than the first contiguous area, and shaped like the first human subject, and the second contiguous area comprising a plurality of appendage-like sub-areas representing appendages of the first human subject, wherein the appendage-like sub-areas of the virtual shadow are larger than but proportional to the appendage-like sub-areas of the virtual avatar, wherein the virtual shadow is configured to illustrate, a proper form of the athletic movement, such that if the first user is performing the proper form of the athletic movement, then the first contiguous area is entirely within the second contiguous area; determining, by a processor, an amount of overlap between the virtual avatar and the virtual shadow; and generating a feedback score based on, at least in part, the amount of overlap.