Answer:
I have been a gymnast for about 7 years, and i say that 5 minutes per day is good to improve your flexibility, if you are a beginner.
If you are a little bit flexible i would say 20 minutes so you get more felxible way faster.
Explanation:
I believe one method is by trying it's hand at "oil farming". Using UN-imported oil for energy use is cheaper. Another is by using Solar energy that can be collected as long as there is sunlight. :)
Biological, psychological, and environmental factors
A. acute
Acute exposure is short time and the negative effects do not accumulate as in chronic exposure.
