The Bio-Arc Leg Curl (BA-708) is part of TuffStuff’s most innovative commercial strength series.  Over a period of three years, TuffStuff tested and modified nearly every component on the machine.  Each design was independently tested – using goniometry testing, along with muscle recruitment and activity measurements through electromyographic (EMG) – and then adjusted and refined for optimal biomechanics.  The end result is the Bio-Arc Leg Curl, which maintains hip angle/pelvic tilt to optimize muscle length throughout the entire range of motion.

  • Optimal Mechanics for Muscle Activation
  • User’s body moves along a linear arc trajectory to optimize muscle recruitment
  • Greater range of motion and muscle contraction at full curl
  • Maintains hip angle / pelvic tilt to optimize muscle length
  • Free flow leg roll automatically adjusts to different leg lengths
  • Leg, back and seat pads designed to maintain neutral positions
  • Quick release allows for easy adjustments
  • Custom upholstery and frame colors available
  • Full Commercial Warranty
SKU: BA-708 Categorii: , ,


The Bio-Arc Leg Curl (BA-708) is part of TuffStuff’s most innovative commercial strength series.  With each repetition, the user’s entire body moves along a linear arc trajectory to optimize muscle recruitment.  As a result, the Bio-Arc Leg Curl allows for a full range of motion and greater muscle contraction at full curl (outperforming traditional fixed position equipment).

Additionally, the Bio-Arc Leg Curl maintains hip angle/pelvic tilt to optimize full contraction of the hamstring muscles, while limiting joint stress.  Please note: includes 200 lbs. weight stack, the weight lifted is the approximate combined user’s weight and weight selected (see Weight Guide label).




TuffStuff Bio-Arc Technology - Independent Machine TestingTuffStuff is proud to introduce the Bio-Arc strength series, the first resistance machines to incorporate multi-planar movement of each machine’s seat, along a linear arc trajectory.  The seat movement allows the user to move along the arc path in conjunction with the machine, helping to maintain more optimal muscle length and improving the force of contraction and training stimulus.

Three years in the making, from concepts and engineering prototypes, to testing and countless refinements.  Each Bio-Arc machine was tested by an independent exercise consulting company.  Pilot research studies combining joint positioning – using goniometry testing, along with muscle recruitment and activity measurements – through electromyographic (EMG) testing.  Each machine was tested to determine the optimal dimensions for final production.  Every detail was measured, and design modifications were executed to exact specifications and re-tested.  The end result is our patented Bio-Arc Technology that allows full body linear arc trajectory motion during exercise.  Learn more >



Since 1971 TuffStuff Fitness International has focused on one thing, the design and development of premium strength equipment.

Over the last five decades, TuffStuff has manufactured the highest quality strength equipment and set the industry standards against which all other equipment is measured.  TuffStuff’s craftsmanship is recognized worldwide, and their products are sold across the United States, Canada, Mexico and in more than thirty other countries.

Today TuffStuff is the only fitness company in the United States with a full-service manufacturing facility, capable of producing every product they sell.  Every design and engineering process begins in Chino, California – from concepts to prototypes, testings and design refinements.  As a result, TuffStuff has greater flexibility to customize products, faster turn around times, and maintains a higher level of quality control than competitors.

TuffStuff’s commercial strength equipment is built to exacting standards, with full commercial-grade components including 7 and 11-gauge tubular steel, inert-gas MIG welded construction, and certified USA-made cables.  Whether you are looking to outfit the world’s finest health club, or you just need a single equipment station that will stand the test of time, with TuffStuff you will receive unmatched product quality and exceptional support.



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