The natural habitats, prevalence, and clinical significance of many recently described Actinomyces spp. have yet to be established. For the majority of these species, few isolates have been studied to date. However, it appears that species including Actinomyces turicensis, Actinomy-ces radingae, Actinomyces europaeus, Actinomyces fun-kei, Actinomyces neuii, and Actinomyces urogenitalis are principally involved in polymicrobial, superficial soft tissue infections in humans but do not cause actinomyco-sis. Natural habitats may include the genitourinary and gastrointestinal tracts and lipid-rich areas of the skin. The cell and colony morphologies of these species can be described as ''nondescript'' and may not resemble the well-known forms of the classical Actinomyces spp. Therefore, they may be easily overlooked in mixed cultures and, consequently, are probably underreported in clinical specimens.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.