Štrombergs was born in Valmiera. His first trainer was Raimonds Ciesnieks. However, the longest collaboration was with Ivo Lakučs. Māris Štrombergs completed the Olympic 2008 BMX in about 36 seconds. Māris completed the Olympic 2012 BMX course in 37.576 seconds. Upon returning from the 2012 Olympics he was greeted by thousands of fans in hometown Valmiera.
