Saša Rajnović teaches kettlebell since 2007. Certified as an RKC (later SFG) and FMS instructor since 2009, and continues to receive education through great number of workshops and certifications, mostly inside StrongFirst. Early in 2014 he is promoted to SFG Team Leader. For him it is a great privilege to be a part of StrongFirst community, being surrounded with such great people full of knowledge.

Saša is the owner of Guerilla Kettlebell gym in Rijeka, Croatia.