Actinomyces spp. are facultatively anaerobic grampositive bacilli that inhabit mucous membranes, particularly those of the oral cavity, of humans and animals. Cell and colony morphologies, aerotolerance, and growth rates each vary considerably between species. At the time of writing, the genus comprises some 29 species, 17 of which have been classified since 1993 with the aid of modern phylogenetic techniques. Recent studies indicate heterogeneity within some species and the existence of additional, as yet undescribed species.
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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.