Best setup for indoor martial arts photography?

[G41.25]

Camera data:

shutter: 1/640 sec
exposure programme: manual
F-stop: f/11.0
Aperture value: f/11
Max aperture value: f/2.8
ISO speed ratings: 100 (funny, thought I'd done it on 80!)
Focal Length: 6.2mm
Flash: Fired
Metering Mode: Pattern