learn to swim on land / sports equipment

People in many areas have few chance to learn swimming for its high requirements of skills and the necessity of a safe swimming pool. Especially the part of legs and feet, learning it takes many time to get the hang of it in the water. So a kind of equipment is needed to help people learn the swimming stroke on land.
My work is aimed at breaststroke’s learning. people can move their feet along the foot track to learn the right guesture. It can make the learning progress easier and more convinient.