They need to have a q system perspective in order to work.
Answer:
The curves help the spine absorb stress from body movement and gravity. When viewed from the back, the spine should run straight down the middle of the back.
Explanation:
There's many options for this but what i have found is the best source for your calcium is yogurt it helps in many ways.
1)30% of your calcium
2)20% of vitamin D
other options-
milk, cheese, eggs, salmon, and spinach