Although you might think “pood” is referring to something your dog did in the yard, it is, in fact an old Russian gyria, a metal weight used primarily to weigh crops in the 18th century. The use of such weights by circus strongmen is recorded in the 19th century. They began to be used for recreation and competition in strength and athleticism in Russia and Europe in the late 19th century. The birth of competitive kettlebell lifting or girevoy sport is dated to 1885, with the founding of the "Circle for Amateur Athletics" Russian girya are traditionally measured in weight by pood, corresponding to 16.38 kilograms (36.1 lb). The English term kettle bell has been in use since the early 20th century.

The USA has had a difficult time adapting the metric system but most of us in the kettlebell world use KG’s when referring to the weight of kettlebells. Though we find it fun to refer to KG’s as Kettle Guys or Kettle Gals it is actually kilograms. 1kg = 2.205 lbs.

When done without the right instruction and progression, these exercises, like those done with any workout equipment, can be harmful to anyone who has shoulder or back issues or a weak core. But when done correctly… with proper coaching… they have a plethora of health and fitness benefits. They can provide greater strength, mental toughness, cardiovascular endurance, agility, range of motion, and mobility. - Men’s Health

There are soooooo many benefits but here is an in depth overview of the TOP 5 from our friends at Muscle And Fitness

https://www.muscleandfitness.com/workouts/workout-tips/5-scientifically-proven-benefits-of-kettlebell-training/