This new footage of Vladimir Putin training with Russia’s judo team is exactly the sort of stunt world leaders with influence like to flaunt. The role of a nation’s president requires someone to be of sound mind and body. Further, public perception matters. Voters may second-guess backing a president without the health, stamina, or heart for one of the toughest jobs on the planet. So it’s important to regularly dispel any concerns about age and health to maintain the image of a strong, healthy, and confident leader.

Putin is a solid six years younger than the United States’ President Donald Trump. Both aging men devote considerable amounts of effort into conveying an image of youthful health and vitality. President Trump uses methods like having the White House doctor tout his excellent health and “good genes,” while Putin prefers carefully-staged photography sessions of him shirtless in the wilderness.

However, Putin also holds a black belt in judo, and spent the early part of his career working as a KGB agent in Russia, where he eventually climbed to the rank of lieutenant colonel before the collapse of the Soviet Union in 1991. Experts once analyzed Putin’s presidential strut and attributed it to what’s called a “gunslinger’s gait,” or a the walk of a man who’s grown accustomed to carrying–and needing to quickly access–a firearm.

As the peer-reviewed British Medical Journal put it, Putin’s stride “may result from a behavioral adaptation, possibly triggered by KGB or other forms of weapons training, where trainees are taught to keep their right hand close to the chest while walking, allowing them to quickly draw a gun when faced with a foe. This should be included in the differential diagnosis of a unilaterally-reduced arm swing.”