It is from this video. It is at around 3 minute and 16 second. The context is a coach shows how to do exercises.
Do it in the one-and-a-half style to reinforce that you have got it up there with the muscle itself.
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get (something) up is transitive and synonymous with raise or lift.
Do it in the X style to reinforce that you have brought it to that height using the muscle itself.
The tenses of the original utterance are rather a mish-mash: to reinforce that you have got it up there.
The recommended approach, if carried out properly, will exercise the muscle in question.