The concept of sisu – used to refer to guts or inner strength – is often talked about as the source of Finnish happiness. And Guts, a hit Finnish TV series about top female cross-country skiers, makes it clear from the beginning that any happiness in this psychodrama is going to be exceptionally hard-won. Featuring vomiting on ice, hallucinations, bullying male coaches and female rivalry, Guts combines the ferocity of competitive sport with cosy homes and pretty snow scenes. Hot on the heels of Heated Rivalry, the Canadian ice hockey romance, it is part of a new wave of shows featuring winter sports. The Finnish broadcaster Yle also has a figure skating drama in its autumn schedules. The trailer for Guts Guts has been a huge success in Finland – where it is billed as Black Swan in snow, after Darren Aronofsky’s 2010 psychological horror film about rival ballerinas – and its star Roosa Söderholm last week won best performance at the Canneseries festival in Cannes.…