Kostas has always been interested in martial arts and combat sports. He was especially drawn to Krav Maga. At the time of his profile, he had trained continuously for seven years and had also taken up teaching it.

He holds a Graduate 4 brown belt in Krav Maga and a blue belt in Brazilian Jiu-Jitsu (BJJ). He is an active competitor and has taken part in events in Greece and abroad. He trains regularly in both disciplines, developing his skills as a practitioner and instructor.

He competed at the first and third Krav Maga Tournaments and at the fourth Alexandreia Interclub Pankration Cup in Katerini, where he took first place and won the gold medal in Pyx Lax, a kickboxing-style discipline.

Kostas continues to train regularly under Guerrilla head instructor Panagiotis Zacharios (Expert Level 3). He speaks English and is familiar with technical terminology.