I have used the power swimmer to teach my 4 year old grandson to swim.
In addition, I am an ARC certified swim instructor; I teach swimming in a city owned facility. I have used the power swimmer in my preschool classes.
This is a valuable teaching aid because it places the swimmer in a horizontal position—necessary for swimming! Other aids may place the swimmer in a vertical position-which interferes with the ability to swim.
CAUTIONS: the Power Swimmer is an instructional aid not a Coast Guard approved life personal floatation device. Remain within arms reach of the swimmer while in use.