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You take a short movie using a camera with a fast framing rate (ie, extreme slo-mo mode), and then, instead of playing back the individual frames sequentially, as a movie, instead, superimpose the interesting frames onto one image.

To estimate the required framing rate, for the sake of an example, let's assume that the club head is going 100 mph (which is ~150 feet per second).  The spacing between the club head on successive frames appears to be about 3 inches, or 1/4 of a foot.  Using the formula, distance = velocity X time, one can estimate the time between successive frames at about 1.6 milliseconds or 600 frames per second.

On the other hand, if this photo had been taken at night instead of during the day, I would have said that it was probably done using an open shutter and a specialized flash unit that can repeat at the same rate, ie around 600 times per second.

HTH,

Tom