True. Aside from warming up, it's a given fact that safety equipment for some specific physical activities are known to lower the risk of getting injured. The most notable sport that need this is skateboarding, where a helmet and some pads are being used.
It's the last answer, number 4.
You have to breath normally during a stretch.
Vaccines, antibiotics are the major ones. Vaccines inject a dead virus or disease to have your body fight it off and become immune to the disease or virus. Antibiotics like vitamins, are something you take daily to protect the body.
The product or ingredient is Nicotine
