The Barbarians (1987)

Orphaned brothers Kutchek and Gore are adopted by a tribe led by Canary the owner of a powerful jewel. The evil Kadar wants both Canary and the jewel. Attacking the tribe he kidnaps Canary but the stone eludes him. The brothers are taken to be trained as gladiators and years later have grown to be VERY big. They escape and set off on a quest to find the jewel and rescue Canary.