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.
Beginning exercisers can start with 15-20 minutes of a low intensity activity, like easy walking, three times per week. As your fitness level increases, first increase the duration and then the intensity of your workouts. Here are some of the many benefits of aerobic exercise: