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.
Aerobic exercise stimulates the growth of new neurons, also known as neurogenesis through the release of brain-derived neurotopic factors. Endurance exercises release Irisin, a hormone linked to improved cognitive function, fat loss and overall health.
What you can do. 1  Brisk walking, jogging, swimming, cycling and dancing are all aerobic exercises, most of which you can do at home. 2  You could join an aerobic class in your area. 3  See the related topic Exercise - check your pulse to find out how well you are doing in your aerobic exercises.