The First Stage
To find the first cache you have to come to the listed coordinates, count and solve this math problem:
A = Number of reflectors (count carefully)
B = Number of goals (count carefully)
The cache is at this coordinates:
N 45° 33.xxx
E 018° 41.yyy
xxx= (a + b)*18 + a*b -(12*a - 36)
yyy= 38*a + 13*b - (a + b)*6 + (a + b + 1)*2
The Final Stage
The first cache contains 4 questions. To find the Final Stage you need to pick one question that you like the most, anwser it correctly and you will get the right coordinates.
Pictures: 
People come here every day to exercise. It's full almost the whole day so watch out for muggles. (There are many of them)
Maybe if you like when you find the cache you can go and run a few laps, play some football, basketball, volleyball or even body build...
Happy caching!
