Eddie Peng, the star of “Unbeatable,” tells the WSJ’s Dean Napolitano about how he got into shape—and what foods he had to avoid—to play a fighter in the mixed-martial-arts movie.

The chemistry between Eddie Peng and his canine co-star led to Peng adopting the dog. Photo / supplied The Un Certain Regard prize at Cannes, which recognises emerging talent and innovative ...