Under red dwarf stars, plant - type life on land may not be possible because photosynthesis might not
generate sufficient energy from infrared light to produce the oxygen needed to block dangerous ultraviolet light from such stars at the very close orbital distances needed for a planet to be
warmed enough to have liquid
water on its surface.
On the other hand, swimming for an hour or two in cool lap - lane temperature
water is an incredible way of losing weight because not only are you burning calories to swim (perform work) but you are burning calories to keep your body
warm enough (
generating heat).