As an article in The Independent explained about this video,
"Pandas generally don’t move too fast. Inclined to slothful activity, it’s unusual to see the animals do much more than look vaguely excited about the arrival of food.
But panda cubs in China’s Research Base of Giant Panda Breeding, in Chengdu, got into a playful brawl earlier this week. The five cubs can be seen rolling and scrapping in their enclosure as they buffet one another after one cub attempts to climb a nearby tree.
Quickly returning to form, the cubs - after a mere 50 seconds of brawling - soon appear bored and each wanders off to separate corners of the enclosure."
Nothing like keeping the brawling in the family! Stay scrappy, cubs.