Konstantin Selivanovs sweat studio in Central Square may offer the most intense total body workout in town. Selivanov, who trained in underground fight clubs in Russia, has perfected a street friendly style of mixed martial arts training. Selivanov has offered group classes for years, but now you can spar with him one-on-one for $90 an hour. Bring tissues he may have you crying like a baby.
91 Sidney Street, Cambridge, 617-225-7977, powerhousekickboxing.com.