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.
Common aerobic exercise types include walking briskly, jogging, running, rowing, cycling, swimming, skiing, and aerobic type classes. Anaerobic type exercises include high intensity activities like jumping, weightlifting, interval training, sprinting, agility drills, and the like.