If the two bloods mix, they may form blood clots
Poor technique because the spotter should have their hands beneath the bar .
A transient ischemic attack or TIA occurs due to a temporary lack of blood flow to a certain part of the brain due to blockage. It usually resolves itself without any permanent damage. It's sometimes referred to as a mini-stroke.
Very open ended question here. It’s yes and no. There are autoimmune diseases that can manifest which you have no control over that can result in muscle wasting. So that being said no your behaviours will not always result in the avoidance of disease. When it comes to injuries, your behaviours can influence it. For example, by choosing to exercise you are increasing risk of injury acutely but also reducing risk of injury chronically. The aim is to get stronger for the long run while jeopardizing yourself through the process.