Man using 10 pound medicine ball during work-out.
A muscle will only strengthen when used to operate past the energy level it usually attains. As a person goes through their everyday life they become accustomed to the strength required whether they are lumberjacks or accountants. For either of them to achieve more strength they need to teach their muscles how to do greater work.
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Location: Chicago IL USA
Photo credit: © Custom Medical Stock Photo / Alamy / Afripics
License: Royalty Free
Model Released: Yes
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