Which species was the first to optimize bipedalism or make walking a habitual practice?

Question

Quizplus · Accepted Answer

Homo erectus/ergaster is believed to have been the first species to fully optimize bipedalism and make walking a habitual practice, evolving approximately 2 million years ago. While earlier species such as Homo habilis and Australopithecus also walked upright, it is believed that they did not have the same level of efficiency and habituation in bipedalism as Homo erectus/ergaster.

Which Species Was the First to Optimize Bipedalism or Make