3.sense of relaxation-known as the relaxation response or stress relief
4.slower breath rate
Mental Benefits:
1.person get more control over his life by gaining control over his
mind and senses.
2.person becomes more aware of his true identity as a spiritual being
and not as his identification such as his body, job, race, religion etc.
3.a person gets more in tune with his true identity and with the
oversoul, universal energy, supreme truth ,Lord or whatever term
you would like to use.
4. inner peacefulness-stress relief
5.Regular practice of the mantra meditation systematically unfolds one's full potential: enlivening the inner intelligence ,developing higher states of consciousness,allowing a person to develope his inherent consciousness while cutting away false indentifications.
This experience of the self-referral state enlivens orderliness, dynamism, and creativity within the meditator resulting in greater effectiveness and success in daily life.
this is explained in the Sanskrit vedas available here in the "Bhagavad-Gita, As It Is."
Try it for three weeks and see if your life is not changed.