Sport Relief Special: Marathon Man (S02E13)

When ever-unfit Jack enters a fun run for Sport Relief, Dani and Sam are convinced he will never make it round the course and so offer to sponsor him for ridiculous amounts of money. It soon becomes clear that Jack is taking his running all too seriously. Dani decides to undermine her best friend. Meanwhile, Max sees Jack's run as the perfect way to raise some sponsorship cash for his own favourite cause – himself. (BBC iPlayer)