A group of people meet there every week on Wednesdays for a 40 min workout.
I survived my first time and loved it. Everyone was so nice, encouraging me on and giving me high five all the way :)
When I was on my last lap and totally finished I looked up and the Hallgrím's church was surrounded by purple light is was so beautiful. I finished the workout and from the car when I was leaving I took a picture on my phone, it is not very good, but you can still see a little of the purple.