US Patent 7677988 Training device for golfers

An apparatus for assisting in training players of golf includes a platform and a first coplanar foot support member and a second coplanar foot support member on the platform, with the first coplanar foot support member being fixed in position and the second coplanar foot support member able to be moved laterally and linearly on the platform relative to the first coplanar foot support member when a golf player places one foot on each of the two coplanar foot support members. A biasing device causes the second coplanar foot support member to be adjacent the first coplanar foot support member, so that in the absence of an externally applied force, the second coplanar foot member remains adjacent to the first coplanar foot support member.