1. A method for precise, mobile acquisition of training data, consisting of the following steps: affixing a mobile device ( 1 ) to a body segment ( 36 , 37 , 38 , 39 , 40 ); determining sensor values in movement patterns by means of said mobile device ( 1 ); calculating training data from said sensor values using said mobile device ( 1 ); storing said training data in a first storage unit ( 15 ) in said mobile device ( 1 ); transmitting said training data from said mobile device ( 1 ) to a computer ( 23 ) via a data interface ( 22 ); characterized by selecting a strength-training exercise with a set movement pattern and a training utensil, from N strength-training exercises and M training utensils by means of a mobile device ( 1 ); recalling predetermined movement data, consisting of the characteristic variables of set movement patterns of one said strength-training exercise X using one said training utensil Y from a second storage unit ( 5 ) in said mobile device ( 1 ); determining raw sensor values using said mobile device ( 1 ) in said set movement patterns of said strength-training exercise X using said training utensil Y, consisting of acceleration and angular speed values; calculating reworked measurement values using said mobile device ( 1 ) depending on said predetermined movement data and said raw sensor values; precisely calculating multiple training data using said mobile device ( 1 ), on the basis of said reworked measurement values.