Your narrator met an old friend while practising for a triathlon the other day. That is, he was practising for a triathlon: I'd just taken a taxi to the shop for a second box of donuts.

NOT that that means this writer is unhealthy, oh no. I once managed to separate two supermarket trolleys WITH MY BARE HANDS, and as everyone knows, staff weld those things into single units every night to torment shoppers.