Based on Jennifer's social and outgoing personality, her dislike for sitting for long periods, and her need for variety to stay motivated, the two jobs she would be most suited for are:
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Sales - This role often involves interacting with people, flexibility, and dynamic environments, which would likely keep her engaged.
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Waitress - This job requires social interaction, is typically fast-paced, and involves moving around rather than sitting at a desk.
Both of these jobs provide the variety and engagement that Jennifer enjoys.