EDIT: for anyone saying he would have had to hold this pose for at least 2 minutes, That is highly unlikely. Exposure time was down to seconds if not fractions of seconds at this point.
They were already on the the cusp of MAKING MOVIES. The Great Train Robbery was filmed in 1903 and it sure as heck did NOT take two minutes to capture each of those frames.
The year BEFORE this photo was taken (1900) Kodak released a camera for children that had a shutter speed of 1/40th of a second.
Fast Shudders had been a thing for about a decade by this point.
I've added another photo from the same collection (possibly a using different camera) of a person ACTIVELY DANCING, there is a blur but there is no two minutes of dancing blur