ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Physiotherapy equipment. These exercise balls, known by a variety of names, are used when exercising and during physiotherapy. Their inherent instability causes more of the body's muscles to respond to maintain balance, thus providing a better work-out. Physiotherapy is the use of exercises to regain mobility and strength. It can be used after injury, surgery or a long inactivity.
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