After his playing career, he dedicated himself to fitness and conditioning training, quickly achieving significant results. To date, he has worked as a coach with four national team players in handball and basketball, which attests to his skill and reputation in sports circles.

Nikolić combines his personal experience from professional basketball with a modern approach to physical preparation, emphasizing the development of strength, explosiveness, and endurance in elite athletes. His goal is to provide athletes with maximum on-field performance and long-term stability through injury prevention.