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.
Aerobic exercise is essential to muscle health for several reasons. During aerobic exercise, your heart rate increases and your blood flows more quickly, carrying more oxygen between your lungs and muscles. Aerobic activity helps to promote overall health, which in turn makes it easier to maintain muscle health.