In this special programme on mental health, Michael Mosley runs an experiment to find the best way to beat stress - mindfulness, yoga or gardening. We also discover how sleep affects mental health and why laughing can be as good as exercise for improving mood.

Sam Neill narates an in-depth exploration of New Zealand and its amazing and obscure wildlife.

Ben journeys from Stroma, inhabited 1,000 years ago, to Swona, its first inhabitants being the Vikings and then to the towering prehistoric cliffs of St Kilda, the most remote of Scotland's islands.

Steve Backshall is on a mission to create a new generation of shark saviours, assembling a team of ordinary children to undertake a boot camp at a shark sanctuary in the Bahamas where they'll learn how to interact with sharks.

Simon Reeve embarks on a journey to discover the wild and remote landscapes of South America and their human stories.