Energetic participants laced up their running shoes for a day of exploring the oasis in the heart of Leeds.
The half marathon involved five gruelling laps of the 700 acre park, with stunning views of Waterloo Lake and concluding with a rewarding ascent to The Mansion building at the end.
Meanwhile, 10k participants tackled the course that comprised one lap of the park before two larger circuits, each offering glimpses of the natural environment before a final climb to The Mansion.
YEP photographer Steve Riding was there to capture all the action. Here are some of the best photos -