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 very warm clothe. 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.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.