US Patent 10112095 Sports training device

A sports training device has a circular main housing having opposed top and bottom surfaces each having a plurality of bosses formed thereon, a channel formed within an intermediate housing section of the main housing and extending therethrough, and a fastening mechanism seated within the channel and secured to the main housing by a fastener. The fastener mechanism can include a first fastener part and a separate and independent second fastener part that can be coupled together. The training device also includes a cord element having a first end portion mounted between the first fastener part and the second fastener part and being mechanically retained therebetween, wherein the cord element extends outwardly from the channel.