Bouncy, bouncy

Unfortunately, I don't know the name of this place.  The boat had stopped to take on supplies and we joined a group who were doing a fast walk around the port,  Back on board, i noticed these Young people who were taking their exercise in a different form.  they were very agile and were able to keep their balance on these extended "legs" .  I think the riverside was a good place for such activities and for cycling.