Arkady Rotenberg Arkady Rotenberg Arkady Romanovich Rotenberg (, born December 15, 1951 in Leningrad) is a Russian businessman and tycoon. With his brother Boris Rotenberg, he is co-owner of the Stroygazmontazh (SGM) group, the largest construction company for gas pipelines and electrical power supply lines in Russia. He was listed by "Forbes" in 621st place among the world's wealthiest persons in 2014. He is considered a close confidant of president Vladimir Putin. As of November 2017, "Forbes" estimates his fortune at $2.5 billion. He is subject to personal sanctions by the United States government related to the events during the Ukrainian crisis.
Sparring their emotions under control. The level of contact is also debated, lighter contact may lead to less injuries but hard contact may better prepare individuals for competition or self-defense. Some sport styles, such as sanda, taekwondo, tang soo do, Kyokushin kaikan, kūdō, karate, kendo, and mixed martial arts use full contact sparring. Brazilian Jiu Jitsu sparring is full contact and injuries are rare as it does not involve striking but rather forcing the opponent to submit using grappling techniques. There is a lot of controversy in mixed martial arts about the benefits of full contact sparring vs career threatening injuries.