No Time to Practice? Use Your Lunch Hour!
Choose one of the 3 fundamentals - strong posture, strong voice, or strong eye contact - and give it some intentional focus during your lunch break. When you are standing in line to order your sandwich, balance your weight and elongate your spine. When you speak to the cashier, use optimal volume. When you are sitting at the table chatting with friends and colleagues, focus on the duration of your eye contact.
It doesn't matter if the setting is formal or informal, improvement happens when you practice on purpose!