In the corner of the ring, François, 44, continues the blows. Direct right, left hook, uppercut. The whole panoply of the boxer goes there, while another member, in the center of the ring, takes up the basics: shoulder movements and movements. Facing Stéphane stands Samir Machrouh, former boxer and trainer of the France team, and co-founder of the France Boxing Club, open since January in the 16th arrondissement.