Polar bears are in danger of extinction in the future if globalwarming continues, as their habitat, Arctic sea ice, is shrinkingevery year, making it difficult for bears to have enough food tolast through the lengthening summers.With a population of nearly 25,000, the polar bear is not in dangerof extinction now.
1 In general, anything that is good for your heart is great for your brain. 2  Aerobic exercise is great for body and brain: not only does it improve brain function, but it also acts as a first aid kit on damaged brain cells.
Article continues below. Aerobic Conditioning. Aerobic exercises increase blood flow to the muscles and soft tissues of the neck and upper back, which can help loosen the muscles and increase range of motion. In addition, endorphins are also produced after about 30 to 40 minutes of aerobic exercise.