[The Conversation Africa] The spread of the coronavirus has forced millions all over the world to retreat to base and abandon outdoor exercise and gym sessions. If they own a big house and garden, it's manageable, but many live in shacks, cramped houses or tiny high-rise flats. How can they avoid going to seed during lockdown? Gavin Evans takes a look at how former boxer and South African liberation struggle icon Nelson Mandela adapted while incarcerated in a tiny cell on Robben Island.