At the age of 12, he was recruited for the Moroccan running team and sent to Rabat to train. Foreign ten years he participated in international races under the Moroccan flag. In 2004 during a race in France where he participated under the Moroccan flag, he raised the Saharawi flag above his head during the last few hundred metres of the race.
Immediately after that he sought political asylum in France, as this action would likely have led to imprisonment in Morocco.
Ameidan was imprisoned for a short period in 2009 after participating in a demonstration in El Aiun. Since 2004 he has been competing with a French team in competitions organized by the French Sport Federations, but as a Sahrawi athlete in international competitions.
In 2013 a film, called The Runner, was released about him by the Egyptian/Palestinian/British documentary film maker Saeed Taji Farouky.