47.5 MB (2.2 MB compressed)
3328 x 4992 pixels
28.2 x 42.2 cm ⏐ 11.1 x 16.6 in (300dpi)
MARK TURNBALL / SCIENCE PHOTO LIBRARY MARK TURNBALL / SCIENCE PHOTO LIBRARY
Strength training. Man using a resistance machine in a gymnasium. Strength training is the use of resistance (gravity, elastic or hydraulic forces) to oppose muscular contraction. This builds the strength, endurance and size of muscles.
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