The calculation estimates where the child is in his or her physical development. The calculation indicates when the child will reach the maximal growth rate (APHV; Age Peak Height Velocity) and in which ASM stage the child is located at that moment.
The biological developmental age determines for a large part what is trainable and what is less trainable in children. Stage P1 includes, for example, other training types, but also another balance between intensity and volume when compared to stage P2 or P3.