Slow sync

Slow sync flash: using your flash with a slow shutter speed. It helps you keep your subject sharp while capturing motion or a dark background.

Equipment:
Light source (in a studio)
Tripod
Light meter
Plain dark background 
Snoot
Reflector
Modelling light

Slow sync is used to take photographs of movement, whilst keeping the subject sharp so that the audience can see the facial features etc. I really think that this shoot works very well because we can definitely see the movement, in some of my photographs I think that it doesn't look very good, for example, the photograph directly below, it doesn't really show movement, it just looks like a shadow of a person in the background, I think this works best if your subjects move a lot, children might be a good subject for this technique. Children tend to move around a lot and this technique might be able to show it well.