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SPRI pioneered the concept of rubber resistance more than two decades ago and continues to be the leader in providing professional quality rubber resistance fitness solutions. The SPRI Exercise Training Kits combine SPRI Xertubes , Xerings , Xerball and/or videos and instruction manuals. Be sure to look at Exercise Ball Kits and the Total Body Makeover by Bob Greene, Oprah Winfrey's personal trainer.
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