Kostelecky’s career took off when he decided to pursue shooting over university education. At age 21, he competed in the 1996 Olympic Games in Atlanta. His most memorable achievement came in 2008 when he won gold in the men's trap event at the Beijing Olympics.

Training and Coaching

He trains with ASC Dukla in Hradec Králové under national coach Petr Hrdlicka. Kostelecky uses his right eye and right hand for shooting. His training regime benefits from the proximity of the shooting range built by his grandfather.

Personal Life and Interests

Kostelecky is married to Lenka Kostelecka, who has represented Slovakia in shooting. They have three sons: Denis (born 2010), Alan (born 2014), and Daniel. His hobbies include tennis, golf, and squash.

Challenges and Philosophy

In August 2019, Kostelecky was diagnosed with borreliosis (Lyme disease), which affected his performance at that year's European Championships. Despite this setback, he continues to follow his sporting philosophy: "The one rule in sport is that there are no rules."

Awards and Honours

In 2011, he was named Shooter of the Year in the Czech Republic and Athlete of the Year in the Hradec Kralove region. These accolades highlight his dedication and skill in the sport.

Mental Coaching

Kostelecky credits much of his success to working with a mental coach. He believes that having a mental coach is now essential for athletes. His gold medal at the 2008 Olympics was a result of a four-year collaboration with his mental coach.

Future Plans

Looking ahead, Kostelecky aims to continue competing at high levels. His dedication to shooting remains strong as he balances his roles as an athlete and coach.

Kostelecky's journey from a young shooter to an Olympic champion showcases his commitment and resilience. His story serves as an inspiration for aspiring athletes worldwide.