Pavel Tsatsouline (Belarusian: Павел Цацулін, translit. Paveł Caculin) is the Chairman of StrongFirst, Inc., a fitness instructor who has introduced SPETSNAZ training techniques from the former Soviet Union to US Navy SEALs , Marines and Army Special Forces, and shortly thereafter to the American public.Tsatsouline is particularly notable for popularizing the kettlebell in the modern era in the West, most notably through his books and through a series of instructional videos, delivered with his trademark comedic intent, comically exploiting Russian stereotypes with a thick accent, a dungeon-esque setting, and frequent use of the word "comrade".