Stand Up Paddling, that's what's up. My brother-in-law Gavin is the water sport king and he's really gotten into SUPing lately.
Gavin in a power pose
He and his friend Warren can be found most evenings (warm, cold, rainy or clear) paddling up and down the coast of Lake Ontario in Scarborough, often in the shadow of the nuclear power plant. It's great exercise, especially when you go for hours (and dozens of kilometres) at a time, as these guys do
I don't know if brightly coloured clothes are a requirement of the sport or just a fashion statement.