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!
Suppose you can swim for 20 minutes, with generous breaks at each end of the pool. You should plan on swimming for 30 minutes, then, so that your actual exercise time (as opposed to rest time) ends up around 20 minutes. To begin, commit yourself to three times a week, 30 minutes per workout.