La Spinassienne takes runners through Épinay-sur-Seine, north of Paris, featuring a half marathon of just over 21 km as its primary event. The program also offers a 10 km race for participants aged 16 and up, and a 3.8 km race open to those 14 and older. Starts are staggered throughout the morning; the 10 km begins at Espace Lumière, with the shorter race commencing shortly thereafter.
The course follows city streets and extends along the Seine's banks, presenting an urban river run rather than a rural excursion. Certified by the French Athletics Federation, the race provides pacers for the 10 km and half marathon, along with aid stations offering water, sponges, and fruit. Prior to each start, participants can engage in a music-led group warm-up at the municipal sports park. One euro from each bib benefits Les Restos du Coeur, and prize money is awarded to the top five men and women in the half marathon.