The first step would be contacting your local sporting goods store, as many will purchase used (but still usable) items such as rackets, gloves, sneakers, cleats, apparel, protective equipment (like shin guards and knee pads), balls, skates, skis, and snowboards, and then resell them. One such store is Play It Again Sports, which has locations ...
https://www.greenmatters.com/p/recycle-sports-equipment