So this is the idea if I ever want to make a documentary in future:

The story will revolve around a group of wrestlers who come daily to their practice area which is situated in a graveyard in the city of Lahore, Pakistan. Despite the lack of facilities, their mentor ‘Ustad’ provides his couching to students. Regardless being in a same sport and it is based on individual effort, there is no jealousy among the group and it is their bond that provides the joy of watching them perform. This documentary will focus from the preparation of the ‘Akhara'(square ring of dirt on ground) to their relationship, aggression and the excitement that they have in the ‘Akhara’.

Approaches to film this except for interviews.

I think the observational style as coined by Bill Nichols would be the appropriate way to shoot, as this style has no interviews with the subject. Many different approaches can be made. Following shoots comes into my mind

1, Mid shoot of these wrestlers coming to the area.

2, extreme closeups of their gear changing (Keeping it mysterious for a while)

3, wide shot of the empty ground.

4, closeups of preparing the ring

5, may be add elements of poetic mode with some music which would portray rushing towards finishing it up.

6, Mid shot to close ups of their emotions (aggression, laughter, the energy, excitement) while training

7, wide long shot of them leaving the ring and going back home.