Boris Romanovich Rotenberg Boris Romanovich Rotenberg Boris Romanovich Rotenberg (, born in Leningrad on 3 January 1957) is a Russian business man and oligarch. He is co-owner (with his brother Arkady Rotenberg) of the SGM (StroyGazMontazh) group, the largest construction company for gas pipelines and electrical power supply lines in Russia. He was listed by Forbes as Russia's 69th wealthiest person in 2016 with a net worth of $1.07 billion. He is considered a close confidant of president Vladimir Putin. Rotenberg was very involved in martial arts between 1968 and 1978, particularly judo. He trained alongside Vladimir Putin and won several awards for
Sparring Former Ultimate Fighting Championship fighter Jamie Varner came to an early retirement because he had a lot of head trauma in full contact sparring. UFC former welterweight champions Robbie Lawler and Johny Hendricks don't do full contact sparring. Sparring has different names and different forms in various schools. Some schools prefer not to call it sparring, as they feel it differs in kind from what is normally called sparring. Sparring Sparring is a form of training common to many combat sports. Although the precise form varies, it is essentially relatively 'free-form' fighting, with enough rules, customs, or agreements to make