Mindaugas Mizgaitis engaged in the sport since 1997. His coaches are Valentina Mizgaitis, Grigorijus Kozovskis, Ruslana Vartanovas. His former coach was Vytautas Burakauskas.
Mindaugas Mizgaitis completed his Bachelor's degree at the Faculty of Sportedukologie of the Lithuanian Academy of Physical Education. Mindaugas Mizgaitis belongs to the Lithuanian Volunteer Corps ( Krasto apsaugos Savanorių pajėgos ).
At the Olympic Games in Beijing in 2008 Mindaugas Mizgaitis won the bronze medal in Greco -Roman style, class to 120 kg ( Super Heavyweight ) on 14 August 2008 ( Summer Olympics 2008/Ringen ).