The only thing we really know with 100% certainty is that humans have been taking DMT for several thousand years. In 1990, two mummified human bodies were dug up near the Matanza River in northwestern Argentina. The mummies were very well preserved, both being adorned with high quality woolen mantles.
Just 30 minutes of swimming three times per week can boost your energy levels through increased metabolic rate. Exercising without the sweat. If sweating puts you off other forms of exercise, fear not!
If you are trying to lose weight, then the National Academy of Sports Medicine recommends, 3-5 days of cardio per week, 20-60 minutes at a time, at 60%-90% of your maximum heart rate. Though, given our busy lives, it may be more realistic to go with 5-7 days with 30 minutes of cardio at a given time.