Novice riders brave insults and risk of physical attack to train for international competitionsSix mornings a week Zahra Alizada is on her bike long before 5am, slipping through the grey pre-dawn in a small pack of women savouring the brief peace on Kabuls normally hectic, dusty streets.Afghans rise early, and many of them are still scandalised to see a woman in sports kit speeding past on a racing bike.