As a prank, the former Reds striker was introduced as the new LFC Foundation coach who would be helping with the session, much to the surprise and confusion of the families taking part.
Once over the initial shock, the families joined Robbie in games of rounders, mini-tennis and relay races, and both kids and their parents enjoyed asking him questions about his career and having their photograph taken with him.
Open Goals is a programme of free sports and physical activity sessions that take place every weekend in public parks across the Liverpool city region, run by coaches from LFC Foundation.