Purpose: The overall purpose with the study was to investigate how active teachers considered physical activity in the swedish school subject ”idrott och hälsa”(physical education). Further the reason was to investigate how teachers follow-up and evaluate the students physical development in secondary school and how the student are getting involved. The study has focused the following questions: • How do teachers of physical education define physical activity? • Do the teachers measure, and in that case how do they measure the students physical development in secondary school? • If they are doing measurments, how do the students get involved? Methods: The survey consisted of an interview study of four active teachers and even a survey of students from the classes of these teachers. Both approaches have been aimed towards the answer the studyquestions, but the main focus has mainly been on the outcome of the interviews. It is through these teachers' thoughts and opinions emerged and student responses from the questionnaires has been useful to see if they can be fed back to the teachers descriptions. Results: The Teachers in the study has no clear periodic testingsystem, where pupils' physical development clearly is measured. The teachers argue to be able to see that students develop physically also without special tests. The moment you book results in which annual returns in the teaching of the four teachers are crosscountry-running. None of the teachers have regular testing in strenght, speed, coordination and movement, and not even half the students state that the teacher after a physical test to discuss the test purpose, student performance and how the connection with previous test results of students' physical development. The teachers seem to fear that the focus should fall too much on profit and competition in tests and thus could not justify the weaker students to want / dare to be involved in teaching. Top-mount seems to be that it is important that students compare with himself and became aware of their own development. A very large proportion of students (62 out of 75) also indicates that they think it is good with physical tests in physical education.