.. for fun. This year the Stockholm midnight run attracted some 25,000 participants that made it around the 10k course. And yes, apart from (a few) steely eyed young males that ran with great seriousness, most seemed participate for fun.
Freddy's Photo Project
Freddy's Photo Project 
Very nice capture of the runner’s movement.
Thank you!
You’re welcome
Nice shot for this challenge, Fredrik.
Thanks, glad you like it
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Wow!