Getting to know the water, hiding under water, staying under water for 10-15 counts. Teaching floating / gliding on the abdomen, resp. on the back with and without different devices.
From the "Bathtub" group, the "Beginner 1" group can be a child who is able to float and glide on the surface of the water in the training pool without the help of an aid and an instructor.
The basic condition for joining the Bathtub group is a height of 104 cm!