Richard Dunwoody visits Paul Nicholls's stables in Somerset and attempts his famous hill climb both on horseback and then on foot with decathlete Dean Macey.
Available to UK users only
JOHN SMITH'S GRAND NATIONAL Aintree, Saturday 9 April, 1615 BST
Coverage: Live on BBC TV, HD, Radio 5 live, online
Other races also across the BBC 7-9 April