⟩ Could you tell me which the biggest and/or most powerful human species was in the past?
Neanderthals were very strong, but there are some fossils of earlier hominins from Europe (Homo heidelbergensis, e.g. Atapuerca) and from Africa (Homo rhodesiensis, e.g., Bodo, Kabwe) that were also very big, strong people.
It is we very gracile postglacial humans, who were divergent from our Ice Age ancestors.