I don't know if it's all over the country but round our way there is a sudden surge of health walks - groups of usually quite elderly people with leaders in high-vis jackets at front and back. I think it's great and hesitate because this sounds quite patronising but they look so lovely and sweet - they are always chatting away and very perky and sprightly looking and they remind me of an infant school crocodile with a teacher at each end.
On my second to last run I was in a local park and there they were, maybe 20 of them up ahead - I soon realised I was barely gaining on them and I thought it would be so embarrassing to go past only just faster than they were walking that I turned off and went another way.