Intelligence is our response, to a given situation, where the outcome is to be apprehended and measured against our preconceived notions. Its widely subjective, even when there would be consensus about the outcomes. eg falling on a floor due to slipping, is not too intelligent and dancing properly; isn’t achieved by all. But there is consensus that one has to stand stable and thats intelligent.
What if the situation is different and a dynamic one; one might and a big fraction might fall. Its that spur of the moment response and success which is a measure of our intelligence, among other variables, such as physical dexterity. So, mental intelligence, as opposed to physical intelligence. eg Hawking has to be intelligent, but only mentally intelligent but an acrobat could be both physically and mentally intelligent; to varying degrees.