Mantras works best when one chant them or recite them while sitting in front of the associated God or Goddess and performing other associated pooja. But it also works when are chanting them while you are doing some other activity or only listening the mantra paath.
When we recite a mantra that utilizes the part of our brain which deals with our power to connect with the outer world. When we recite a mantra with the clear intent and focus on the power associated with it. The part of brain transmit the same to the outer world and synchronization happen between the person and the superior energy source. This process when repeated over a period of time with consistency and devotion leads to fulfillment of the desired results.

Mantras works best when one chant them or recite them while sitting in front of the associated God or Goddess and performing other associated pooja. But it also works when are chanting them while you are doing some other activity or only listening the mantra paath.
When we recite a mantra that utilizes the part of our brain which deals with our power to connect with the outer world. When we recite a mantra with the clear intent and focus on the power associated with it. The part of brain transmit the same to the outer world and synchronization happen between the person and the superior energy source. This process when repeated over a period of time with consistency and devotion leads to fulfillment of the desired results.