Pavel Tsatsouline, (Belarusian: Павел Цацулін, romanized: Paveł Caculin; born 23 August 1969 in Minsk, USSR) 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". Vic Sussman among others praised Tsatsouline's videos because their power as training tools in part stemmed from the emphasis on kettlebells as fun. Pavel's strength training exercises were soley focused on practical strength and mobility. For him bigger did not always mean stronger.