Kickboard / Swimming board
A swimming board, also known as a kickboard, is widely used to improve the beetrap technique when swimming. The best kickboards are of course the kickboards that provide optimum buoyancy so that you can do the exercises undisturbed.
There are swimming boards with handles such as the swimming board of Arena and Roka. In addition, Roka has a variant without shining. However, it has been made ergonomically so that you can feel comfortable here