"When an individual reaches, pushes, or pulls on(or from) a sitting position."
grammerly`s answer is that because individual reaches is plural subject, an indibvidual reaches was changed to individual reaches.
I think, subject is an individual, verbs are reaches, pushes, or pulls.
However, grammarly`s answer informs that individual reaches is subject.
My question is which "on a sitting position" or "from a sitting position" is correct.
In addition to that, when using on or from, What different meaning between on and from
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