Career
Before his sporting career ended in 2010, Kumar trained full-time for Subash Varma Wrestling Club in his native New Delhi, under his coach and mentor Subash Varma. On that same year, he competed for the Indian wrestling team at the Asian Games in Busan, South of Korea, but left the tournament empty-handed and injured. At the 2004 Summer Olympics in Athens, Kumar qualified for his first Indian squad in the men"s 84 kg class.
Earlier in the process, he placed third and guaranteed a spot on the Indian wrestling team from the Olympic Qualification Tournament in Sofia, Bulgaria.
He lost two straight matches each to Iran"s Majid Khodaei (1–5) and Japan"s Hidekazu Yokoyama (5–11), leaving him on the bottom of the prelim pool and placing sixteenth in the final standings. Shortly after the Games, Kumar ended his medal drought by picking up a bronze at the 2005 Asian Wrestling Championships in Wuhan, China, and continued to repeat the same outcome in Pattaya, Thailand four years later.
Following another medal record, Kumar retired from competitive wrestling career to focus on his personal life.