Re: EE 'Doc' Smith? Larry Niven?
The Valerian colonists were huge and powerful ...
Showing an inability to understand basic physics (and Darwinian evolution). The larger a structure, the less able it is to resist gravity. A flea can survive hundreds (thousands? ) of self-inflicted gravities every time it jumps. A mouse can fall off a cliff and run away at the bottom, unharmed. A human being over seven foot tall is freakish, and at a clear evolutionary disadvantage. (Much more likely to break bones when he falls over, for starters).
Inhabitants of high-G worlds will be small by Earth standards. Rugged and powerfully muscled for their size, certainly, but above all sufficiently small as to be able to resist gravity.
Also unlikely to be bipedal, unless their nerves and reactions are much faster than ours. The consequences of falling over in high-G are greater, and the time available to avoid doing so is much less. Think small thick-set centaurs or wallabies.