https://www.nhm.ac.uk/discover/homo-erectus-our-ancient-ancestor.html

“The extinct ancient human ‘Homo Erectus‘ is a species of firsts. It was the first of our relatives to have human-like body proportions, with shorter arms and longer legs relative to its torso. It was also the first known ‘hominin’ to migrate out of Africa.”

Make sure you have a look at the reconstruction of Turkana Boy, the approximately 1.5-million-year-old, nearly complete skeleton discovered in Kenya. He was only about nine years old and already 1.6m tall.