Maintain enough distance so you can hear the person but are not in their face. Relax (do not slouch or hunch) your shoulders and spread your feet shoulder-width apart so your body weight is balanced evenly on both legs.
[header] How to be more aggressive [title] Be assertive in your posture. [step] You want to appear in control, poised, and confident without looking awkward or uncomfortable. [substeps] Approach someone directly, rather than from the side of behind.