《乐在足下》是一部关于轮滑组的电影，主要是讲每天早晨到天津水上公园滑轮滑的老人们。这部电影介绍了公园常客对轮滑运动的感受，以及他们和这一空间的联系。影片尝试进入退休老人们的世界，关注他们是如何享受在水上公园的生活。

Happy Feet is about a skating group, comprising mainly of elderly people of Tianjin，who visits the water park every morning and enjoys skating among themselves. The film introduces some of the regular visitors of the water park, their feeling about the sports and their relationship with the space. It basically attempts to see the world of the elderly people after their retirement, how they enjoy the time at the water park.