In Gaza, an unspoken rule bans women from riding bicycles after they have hit puberty. But last Saturday, one young Palestinian woman decided to defy the taboo, sparking smiles - and a few threats - from fellow Gaza residents. In a spur of the moment decision, 28-year-old Palestinian journalist Asmaa Alghoul decided to join three of her friends, two Italian human rights workers and an American, on a tour of Gaza by bicycle. On a warm summer's day, the two men and two women set off from the Egyptian border town of Rafah and headed north to Gaza city, along 30km of coastal road. But to Asmaa, the ride was more than a sunny day trip: women on bicycles are frowned upon in most Muslim societies, and the young woman had not ridden a bike since she was 14 years old.