He is deemed the founder and leading pioneer of the physical discipline parkour, coining it based on his training and the teachings from his father Raymond Belle.

His grandfather Gilbert Kitten, father Raymond, and brother Jean-François Belle were highly skilled rescuers in the Military Paris Fire Brigade.

He made close friends with a group of teenagers with similar physical passions who began training with him, transferring the techniques he learned in Normandy to an urban environment.

During his time in the Marines, he set the Regimental record for rope climbing (which was previously held by his father, Raymond) and earned a certificate of honor for his gymnastic abilities.

Belle was first introduced to his acting career in a meeting with Hubert Koundé (La Haine), in order to discuss the success of parkour in cinema.

He then began developing his acting ability with the play Pygmalion, and has since been successful in obtaining a number of roles mostly in French films and promotions.