I came across the following instructions for a shoulder-strengthening exercise:
"Limit the height that you raise the arm horizontal to the floor."
I cannot decide whether "horizontal to the floor" is correct. Would it be wrong to use "horizontally" instead?
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Hi, MileSim. "To" means " In a particular relationship with: The brook runs parallel to the road." (quote) "Horizontal to the floor" is correct.
So, in both my example and yours, the adjective phrase (I am not sure if that is the correct term...) "horizontal/parallel to the [X]" is modifying the verb as an adverb?
Hi, MlleSim and f6pafd,
If an adjective is used in the predicate, it can be a subject or an object complement depending on whether it refers to the subject (the brook runs parallel to the road) or to the object (raise the arm horizontal to the floor).
"Horizontally" would also be correct to refer to the manner of raising the arm, rather than to the position the arm acquires after being raised (here "horizontal" has a resultative meaning). However, from a logical point of view, one cannot raise one's arm horizontally as one can raise a beam lying on the floor horizontally until it reaches an upper position, because the arm is not originally in a horizontal position.
Even so, there are several examples at GB of an arm being moved in a horizontal way, for example this one taken from a book identified as "Army Volume 29":
@Gustavo, Co-Moderator posted:"Horizontally" would also be correct to refer to the manner of raising the arm, rather than to the position the arm acquires after being raised (here "horizontal" has a resultative meaning). However, from a logical point of view, one cannot raise one's arm horizontally as one can raise a beam lying on the floor horizontally until it reaches an upper position, because the arm is not originally in a horizontal position. Even so, there are several examples at GB, for example this one taken from a book identified as "Army Volume 29":
Thank you, Gustavo, for this excellent reply. Your examples using the beam and the military are most helpful because those are precisely the ones I had come up with and was mulling over! Your explanation and visuals (!) satisfy me entirely. 
Thank you for your kind words, MlleSim. As the saying states, sometimes an image says more than a thousand words
