Manchester United academy player Kai Rooney posted photos of his fitness progress on social media, showcasing a physique far superior to his peers, which greatly amazed fans.

The 16-year-old son of Manchester United legend Wayne Rooney appeared in a tight white vest, a grey knit hat, and the team's youth training gear.

His thick, strong arms, broad shoulders, and pectoral muscles left fans exclaiming in disbelief. Many joked about his excellent genetic make-up and commented that the teenager's physical condition already seemed sufficient for professional adult leagues.