He told the police that he was a former mixed martial arts fighter, it said.
Mixed martial arts has become big business, with a large and growing fan base.
He says there has not been enough study of mixed martial arts to describe the risks.
Among the most successful recent arrivals is mixed martial arts, a combination of boxing and ju-jitsu.
Ultimate Fighting Championship, which started in 1993, is the most recognized name in mixed martial arts.
"He used to be a fighter, MMA fighter, " Taramov said, in a reference to mixed martial arts.
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Mixed martial arts may be drawing bigger audiences now, but unlike boxing, Acunto says, it's not a sport.
But many people are concerned about safety, as states debate whether and how to regulate mixed martial arts.
The International Fight League, for example, consists of 12 mixed martial arts teams.
In late June, a mixed martial arts fighter, Michael Kirkham, died two days after getting injured in a competition.
By this time fighters had begun to learn a variety of fighting disciplines, giving birth to mixed martial arts.
"By his own admission Todashev was recently a former mixed martial arts fighter, " the arresting deputy said in his report.
Acunto says that in his opinion, no rules or regulations would ever turn mixed martial arts into a true sport.
John McCain (R-AZ) called mixed martial arts "human cockfighting, " and called for it to be regulated by an athletic commission.
Fighter Bryan Vetell defends mixed martial arts but balks at the notion of making it a high school sport.
Mixed martial arts has its detractors, among them Stephen Acunto, a longtime member of the New York State Athletic Commission.
Then there's the onrushing wave of Mixed Martial Arts, which Everlast has been smart enough to embrace rather than resist.
Michael Gettys watches mixed martial arts fights every week on SpikeTV and gathers his friends to watch the pay-per-view matches.
Todashev and Tsarnaev were acquainted through a mixed martial arts center near Boston, said a source briefed on the bombing investigation.
Both men were members of the mixed martial arts forum Sherdog.com, along with Russian-Canadian boxer-turned-jihadist William Plotnikov, the source said.
Hammer eventually rebounded, becoming a digital entrepreneur in the fields of dance and wait for it mixed martial arts.
And mixed martial arts, where athletes combine Japanese, Chinese, Thai, Brazilian and American fighting styles, has exploded as a professional sport.
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The rules to which Acunto refers have been adopted in recent years, and they have served to get mixed martial arts widely sanctioned.
Take, for instance, Joe Ellenberger, a former college wrestler aspiring to join the Ultimate Fighting Championship, the often brutal mixed martial arts competition.
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Todashev and Tsarnaev had become acquainted at a mixed martial arts center near Boston, said a source who was briefed on the bombing investigation.
But he's taking Brazilian Jiu-Jitsu classes, and says he's intrigued by mixed martial arts and the Ultimate Fighting Championship, though his mother isn't thrilled.
In fact, Hunt said, mixed martial arts guidelines don't require a sex-change surgery, but they do require two years of hormone therapy for transgender fighters.
Rather than outlaw mixed martial arts, Cantu says he would prefer to see it carefully licensed, and also to see careful observation of the injury patterns.
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