50.1 MB (50.0 MB compressed)
3425 x 5116 pixels
29.0 x 43.4 cm ⏐ 11.4 x 17.1 in (300dpi)
AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Woman using an exercise ball in a gym. These balls are used when exercising because their inherent instability causes more of the body's muscles to respond to maintain balance, thus providing a better work-out.
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