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.
How to Do Aerobics. Broadly speaking, aerobic exercise requires you to work out your large muscle groups like your arms and legs. By raising your breathing and heart rates, you increase oxygen flow to your muscles, while also allowing your blood flow to remove carbon dioxide and lactic acid buildup in your muscles.