This subject was discussed in length in various other threads also. A school has a curriculum and sports is also included in it. Your students get trained in sports only as part of studies but sports is not their primary objective. I don't think that you will take your children to the ground during March or examination is going on. Now like any other faculty member, a trainer is to be employed following the education rule of the state. This is to be followed even if you are an unaided school,ie, school which does not take financial assistance from the government. It is immaterial whether you employ him for the entire day of 8 hours or only for 4 hours a day. In this 4 hours, he has to follow a set of rules,time schedules and follow a dress code etc. In such circumstance, his status is just like a teacher. How can he be called Consultant or Professional? It is true if he comes every day and gives instructions to one or two of your teachers as to how to give physical education to the students. In such cases, the fees that he collects is professional charges. On the other hand, if he comes to your school at 9.30 am and gives training to the students as per a pre designed schedule and leaves at 1.30 pm, he is just like an employee or a part time employee. He should be paid salary, be subjected to PF and ESI, and finally when he leaves the school (after rendering the qualifying service) the school, pay him gratuity. Since everything is linked to salary which in turn is also linked to hours worked, whatever to pay will be lesser than that payable to full time teachers.