If you use this technique, you focus on whatever object or activity you are doing. This type of meditation does not encourage you to do multi-tasking. You can focus on one object such as the breath, the sound of the bell, or the flame of a candle. You can also focus on meditation activities such as cleaning the room, walking, or even while enjoying your favorite tea.
When you are eating, you only focus on the sensation when you eat. When exercising, focus on sensations when exercising. Focus your attention fully on these activities. With consistent practice, this type of meditation can improve your ability to focus.