The first athletics club Ait Khamouch belonged to in Spain was the Athletic Club Nou Barris. In 2004, he participated the Spanish Paralympic national championships where he won a gold medal in the 800 meters. In 2005, he received a scholarship from the Spanish Paralympic Committee. In 2008, he trained at the Center for High Performance San Cugat (Barcelona). He qualified for and competed in the 2011 IPC Athletics World Championships where he was one of thirty-two competitors representing Spain. In 2012, he was a recipient of a €2,500 coaching scholarship. He lost part of his Catalan-based scholarship a year and a half prior to this, a decision that Ait Khamouch labeled as politically motivated. In 2012, he set a world record in his classification at the Barcelona Marathon. In doing so, he also set a qualifying time in the event for the London Paralympics. That year, he also competed in the Barcelona half marathon where he set a personal best time. In July 2013, he participated in the 2013 IPC Athletics World Championships. In November 2013, he competed in the Jean Bouin-Gran Premio Allianz race in Barcelona.