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TuffStuff Bio-Arc Leg Curl

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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).

Additional information

Weight555 lbs
Dimensions64 × 48 × 58 in


10 YEARS: Frames, welds, linear shafts and weight plates.

5 YEARS: Pivot bearings, pulleys, bushings, gas-shocks, and guide rods.

Commercial Warranty

3 YEARS: TrakHandles

1 YEAR: Linear bearings and pull-pin components.

6 MONTHS: Upholstery, cables, finish and rubber grips.

ALL OTHER PARTS not mentioned, one year from the date of purchase to the original purchaser.

Frame Materials

3" and 4-1/2” 11-gauge 120 wall round tubular steel with a combination of 2×4” 11-gauge 120 wall tubular steel.


All welded construction by inert-gas MIG welding conforming with all Structural Welding Code-Steel Standards and Specifications.


Molded PU foam glued to 1” industrial plywood backing, combined with double-stitched premium upholstery.


Premium Bolta Sport vinyl with PreFixx, formulated to resist bacteria, stains, mildew, oil and UV stabilized pigments. Meets most flammability test requirements. All upholsteries are double-stitched with “hidden” borders. Bolta Sport color swatches are available upon request. Sixteen standard colors. Custom colors are available – please inquire with your sales representative.


Choice of two primary colors: Gloss Charcoal Gray with Matte Black accent or Platinum Sparkle with Matte Black accent. Custom colors available, please inquire with your sales representative.


3/16” USA-Made Certified EXERFLEX PRO® high performance fitness cable.

Guide Rods

3/4” solid steel 1045 (tgp) highly polished hard chrome finish

Adjustment Pins

1/2" push-pull spring loaded solid steel adjustment pins with ultimate load of 9040 lbs. and 46042 sheer strength.


4-1/2", 3-1/2" and 2" fiberglass reinforced nylon pulley.


3/4" black painted solid steel plates with reduced noise and self-aligning low friction sleeves. 200lbs. weight stack.

Other Specs

IMPORTANT NOTE: Equipped with 200 lbs. weight stack: weight lifted is the approximate combined user's weight and weight selected (see weight guide label).

CUSTOM STABILIZER FEET: Heavy grade molded rubber base feet insures stability, prevents equipment movement, and may be bolted to the floor.

SELECTOR WEIGHT PINS: Weight pins are solid steel, magnetic with ball-end to ensure a tight connection and secure fit.

FASTENERS: All frame bolts and nuts ard 3/8" and 1/2" zinc plated grade 8. Meets ANSI specifications.

LINEAR SHAFTS: 1" precision Rockwell C60 grade solid shaft.

BEARINGS: 2" High precision linear sealed ball bearing (load rating of 1900 lbs.).

US Patents

US PATENT NO. 9,533,188 B2; 9,539,462 B2 AND OTHER PATENTS PENDING.