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.
Some believe that cardio or aerobic exercise is beneficial for burning fat but detrimental for building muscle. Although aerobic exercise does not build muscle to the same degree as anaerobic exercise, it does not burn muscle. Instead, aerobic training burns calories, improves endurance, reduces stress and boosts your mood, along with a host of other health benefits.