Explanation:
keep boosting your immune system get some Vitamin D and some sun or get Vitamin D from someone son
I think the flat hard surface is to ensure that the patients arm will not move when the needle is administered since it is usually critical that the needle is inserted in the correct vein which is only a fine target requiring careful positioning of the needle.
Yoga can improve flexibility and muscular strength
The most important reason to washing a cutting board is because it can grow bacteria, if it's not washed with bacteria cleaning soap and hot water.