I do jumping jacks to warm up before exercising.
Meaning: I do a physical exercise called jumping jacks to prepare my body for exercising.
Choice of Words: Jumping jacks is a physical exercise where you jump while spreading your arms and legs out and then bringing them back in. Warm up means to prepare the body for exercise by doing light activities that increase heart rate and blood flow to the muscles. Before means prior to or in advance of something.
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