Identify safety preparations that are common when exercising in extreme cold or extreme heat.

When you are in the cold, it is important to stay warm by wearing a jacket, pants, gloves, a hat...etc. It's also important to make sure you can breathe good because for some people (like me) it can be harder to breathe in colder air

When you are in the heat, it is important to wear proper clothing like sweat absorbent shirts. It's also important you stay hydrated by drinking a lot of water. 

Hope this helped! :)

The negative effects of smoking weed underage age includes:
regular use
heart problems
trouble breathing
mental health issues
academic issues
lower life satisfaction