Ronan Horgan watched on with envy as all his friends caught the triathlon buzz. He wanted to join them in both the events and also the accompanying afterparties, but there was one crucial problem: he couldn’t swim. So, as he approached his fortieth birthday, Horgan literally took the plunge with swimming lessons. Since then, he has “completed, not competed” in more than 25 events. Given Horgan has advanced €550 million in loans to Irish businesses though his non-bank lender Capitalflow, learning how to swim might seem trivial. Yet the process taught the Dublin banker-turned-entrepreneur some valuable life lessons. “You always…