Dr Izumi Tabata has developed a punishing exercise regimen that he claims can boost cardiovascular health in minutes – and now he is bringing it to the masses
Amelia Hill: People are keen to offer me their unscientific advice. But I'm careful and know my limits and have no intention of stopping running until I no longer enjoy it
James Ruskin: With the London marathon approaching, many runners will see a day off as a wasted opportunity – but remember that the more you train, the more rest you need - it's quality not quantity that counts
Dharmendra: Seven marathons in seven days? Running from one US coast to the other? If you want to be an extreme runner, you need to do something special