The world that we are living in is the world of noise, computer stimulation, and smartness that causes the brain to stay alert all the time. The contrast is that the natural environment will instantly have a soothing effect. It is not only an emotional or poetic effect of calmness, and this effect is supported by the research in psychology, neuroscience, and physiology. Presence of time can influence the stress hormones and focus and even heartbeat with the trees, water and open landscape. The human body appears to respond to the natural environments so as to help build the feeling of balance and healing. This science of such a reaction is explainable and the reason why going to nature can be a kind of a reset of the mind and body.
Stress Hormones Just beginning to get lower

Leisure has been researching to decrease the levels of stress causing hormones by being in the natural setting. When the body feels like it is in the non stressful and safe environment, then it gets more relaxed.
The Nervous System Swaps the Gears

This is done through stimulating action of the body to change the fight-or-flight to a more relaxed mode. The heart beats and the muscles contract at a slower rate and the breathing is slow. This movement will also aid in a healing process and assist the body to conserve energy rather than spend much of its energy at a high state of tension.
Receives Soft Reboot of Attention

The natural conditions take the form of captivity which comes in the way of movement, light, and sound. This is a light intensity which gives time to the brain to relax. People who have been in nature are more focused after spending time in nature, and less mentally drained.
One feels that the input is balanced

Luke would suggest the landscape of cities would overwhelm our senses. Nature offers more predictable rhythmic sensual patterns. These inputs are easier to process by the brain and this may be translated to a calm and complimented state.
Breathing Patterns Improve

The atmosphere and open air encourage slow deep breathing. This kind of breathing will help to relax and send signals to the body that it is safe and thus reinforce the posture of relaxation.
Controversial Transition of Mood-Controlling Substances

Activities linked to outdoor expenditure are linked to changes in mood altering brain chemicals. Such transformations can get people feeling good and stable in their overall well-being.
Muscle Tension Eases

The body is likely to be relaxed when it is exposed to a relaxed environment. This physical change favors a sense of relief and this reduces feelings of tension.
Mental Rumination Slows

The monotony of stressful thoughts can be achieved by the use of the natural environments. Mind is less occupied and this helps the emotions to recuperate.
Most of the Time are Pictorial Patterns

Nature and its movements e.g. leaves or water are of pattern which the brain can easily interpolate. This may be soothing attention, calming rhythms.
Perception of Direction is Dilated

The large sceneries and nature may shift the focus to the short-term issues. Emotional stability and balance are beneficial to such enlarged vision.