XChange. BBC2 Monday, April 16, 9-9.25am.

Stuck for something to do over the Easter holidays? Tune in to this daily magazine, which this week suggests mountain biking, roller hockey, athletics and rowing, as well as a guide to events around Britain.

We meet a boy who collects snakes, a young jazz musician, Robbie Williams’s flatmate, the stars of The Secret Garden and the members of BB Mak.

Best of the rest

Dying to be Thin. Discovery Health. Sunday, April 15, 9pm.

Former anorexics and their families talk about the condition for an American documentary which also considers the possibility that an imbalance in brain chemicals plays a role. But whatever the underlying causes, the main problem is pressure, as we find out from model Kate Dillon and on a visit to the New York City Ballet, where some ballerinas are not just thin but underweight - 15 per cent are below the recommended weight for their height.

Natural World:. Danube Delta. BBC2 Sunday, April 15, 5.40-6.30pm.

For Easter Sunday, as part of Wildlife on Two, a visit to one of the least known areas of Europe. The Danube Delta is more than 5,500 square kilometres of reed beds, home to more than 300 species of wild birds and to the Lipovani people, fishermen whose lives are the focus of this documentary.

Best on radio

Go 4 It!. Radio 4. Sunday, April 15, 7.15-7.45pm.

Also timed for the Easter holidays is the start of a new radio magazine for children, which gives a leading role to young reporters: junior rowers interview Steve Redgrave on his forthcoming participation in the London marathon; Thunderbirds creator Gerry Anderson is questioned about the successful re-run of the series; and there is a review of the children’s film Spykids. Plus quizzes, competitions, jokes and the first episode of Philip Pullman’s new novel, Clockwork, read by the author.

On the Edge. Radio 4. Monday, April 16, 8pm-8.30pm.

When the Zacchaeus Centre in Birmingham opened, some people thought that it was a boot camp or sin bin for disruptive Catholic schoolkids. It’s a sort of last chance saloon for children threatened with exclusion - but punishment and retribution are not words that staff have time for.

In just four weeks , Zacchaeus has a 69 per cent success rate in keeping children in mainstream school until they are 16. This behind-the-scenes documentary reveals some of the reasons for the centre’s success.

Robin Buss