He had worked as the trainer with Olympic gold medal-winning skier, Janica Kostelić, and football manager, Slaven Bilić.

He is currently fitness coach in Dinamo Zagreb and the Croatia men's national handball team.

[1] Rak was the fitness coach for the Croatia national handball team that won the gold medal at the 2004 Summer Olympics in Athens.

[2] Having studied for a degree is physical education at University of Novi Sad,[1] competing for SFR Yugoslavia, as a long-jumper he took part in the 1967 Mediterranean Games in Tunis winning the gold medal with a jump of 7.53 metres (24 ft 8 in).

[3] Rak worked as a coach in Osijek training athletes such as 800-metre runner Slobodanka Čolović[4] and long-jumper Siniša Ergotić.