Rhian Gough, 42, plays a crucial role in making sure the seafront event can be staged on a weekly basis - and on Saturday she was volunteering for the 100th time.
Volunteers across the country are a critical cog in ensuring parkruns are able to run and Gough continues to do a stellar job at Southsea.
Participating in the 5k esplanade course event, Gianni Shipp recorded a personal best Southsea time for himself, as he was first of the 394 finishers who made it home (16mins 47secs).
First-time visitor Katie Slater lapped up the fresh sea air on the south coast, returning sixth overall and the first female back (18:54).
Elsewhere in the city, Worthing & District Harriers teenager Ethan Neale participated in the Portsmouth Lakeside event for the first time, making it home ahead of the 230 total finishers in a time of 17:58.
Another first-time course visitor, Folkestone Running Club's Deborah Jeffery, led the way in the female section (22:27).
Avid runner James Baker headed for the Great Salterns parkrun, making it back first of the 119 finishers in a time of 16:14.
At the Tangier Road course, Denmead Striders' Lisa-Marie Peckover was the first female home (22:29).
n Lee-on-the-Solent are edging ever closer to a landmark course milestone.
The seafront 5k event, started in April 2015, was staged for the 297th time on Saturday - with the 300 figure drawing nearer.
Stubbington Green Runners' Lewis Banner was first back in the latest Lee parkrun, navigating the course in a time of 16:33.
Nicky Nelson recorded a personal course best time of 21:08 as she led the way for the females.
n Defence Sports & Recreation runner Christopher Pearce was first home for the second successive week at the Fareham parkrun (17:51).
British Military Fitness participant Tina Al-Romaithi was the first female from the overall finishing total of 209 (21:06).
There were 204 finishers at the Havant parkrun as Havant AC teenage runner Joe O'Brien headed things up (18:46). Victory AC's Jo Gilholm was the first female back in a time of 23:06.

. Rhian Gough (42) celebrates her 100th volunteering day, pictured with Run Director Emma Cardey (34). Picture: Mike Cooter (280522)
Rhian Gough, left, was volunteering in her 100th parkrun, alongside her is Southsea run director Emma Cardey Picture: Mike Cooter (280522) Photo: Mike Cooter

. Runners set off at the busy Southsea parkrun
Picture: Mike Cooter (280522) Photo: Mike Cooter

. Approaching the Southsea parkrun finish with a spring in the step
Picture: Mike Cooter (280522) Photo: Mike Cooter

1. Runners set off at the busy Southsea parkrun
Picture: Mike Cooter (280522) Photo: Mike Cooter

2. Approaching the Southsea parkrun finish with a spring in the step
Picture: Mike Cooter (280522) Photo: Mike Cooter

3. Rob Turner, left, with Luciana and Albie in tow next to Alex Radice-Gomm with James
Picture: Mike Cooter (280522) Photo: Mike Cooter

4. Southsea parkrunner completes the course with a canine friend
Picture: Mike Cooter (280522) Photo: Mike Cooter