Aleksei Goloborodko, the world's best contortionist, performs in NYC for the Cirque du Soleil show Luzia. He has been practicing being a contortionist since he was 4-years-old.

Flexibility is important in gymnastics because without the right range of motion, gymnasts will be unable to learn how to do certain skills. In this video we introduce Ukrainian flexible gymnast and handstand athlete PAVEL STANKEVYCH from Ukraine.

Squirrels - the acrobats of the animal world - are helping scientists develop ever more agile smart robots. Engineers have got to the bottom of the split-second thinking of the bushy-tailed rodents. It enables them to leap and land - from the sturdiest wall to the flimsiest branch. The breakthrough...