You have captured the action well here with a good sense of movement. As this is part of a series which is to be published there are some issues which perhaps need to be considered, which might not matter as much if this were just a casual shot:
(1) The toning does not really suit the subject - it looks like a yellowish colour cast from the lighting. A straightforward B/W treatment may be better.
(2) The bright lights have caused a bit of underexposure. The shadows/highlights tool in PS can help to bring out some detail in those areas. Also consider cropping a bit from the top.
(3) It is a pity you have cropped out part of the legs of both the instructor and the instructee.
(4) It looks as if it is the instructor who is putting in the major effort! It may have been better to get a viewpoint from behind the instructor.
I have uploaded a mod for you which reflects some of my comments, which I hope help.