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BUILT Strength Infinite Series Back Extension (New)

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BUILT Strength Infinite Series Back Extension (New)

The BUILT Strength Infinite Series Back Extension is a commercial-grade selectorized machine built to load the posterior chain directly and repeatedly — spinal erectors, glutes, and hamstrings working through a controlled extension arc with smooth, consistent resistance from a 200 lb weight stack. Pin-select adjustments keep load changes fast between sets, supporting everything from warm-up volume to heavy working sets.

Adjustable hip pads and handlebars let every user dial in the correct starting position — proper hip height and grip placement locked in before the first rep, keeping spinal alignment safe and the movement pattern repeatable across an entire session.

Primary muscles targeted

Erector Spinae Glutes Hamstrings

Secondary muscles

Adductors Core

Key features

200 lb Selectorized Weight Stack
Pin-select resistance up to 200 lb — a heavier ceiling than the standard model, supporting advanced athletes running high-load posterior chain programming.
Adjustable Hip Pads & Handlebars
Both the hip pad height and handlebar position adjust independently — locking every user into correct spinal alignment regardless of torso length or build.
Smooth, Controlled Motion
The resistance path follows a natural extension arc with consistent tension throughout — clean mechanical loading on the posterior chain from bottom stretch to full extension.
Barbell Resistance Option
Users can hold a barbell across the upper back to add resistance beyond the weight stack — extending the loading range for advanced athletes who have outpaced selectorized limits.
Heavy-Duty Commercial Frame
Built for high-frequency commercial use — handles daily high-load training in professional facilities and serious home gym setups without compromise.

Specifications

Dimensions (L × W × H)
48" × 39" × 62"
1219 × 991 × 1575 mm
Machine Weight
597 lb
271 kg
Weight Stack
200 lb
91 kg · Pin-select selectorized
Condition
New
Commercial performance standard
Adjustability
Hip Pads & Handlebars
Independent adjustment for correct alignment across all body sizes
$1,153.25

Original: $3,295.00

-65%
BUILT Strength Infinite Series Back Extension (New)—

$3,295.00

$1,153.25

Product Information

Shipping & Returns

Description

The BUILT Strength Infinite Series Back Extension is a commercial-grade selectorized machine built to load the posterior chain directly and repeatedly — spinal erectors, glutes, and hamstrings working through a controlled extension arc with smooth, consistent resistance from a 200 lb weight stack. Pin-select adjustments keep load changes fast between sets, supporting everything from warm-up volume to heavy working sets.

Adjustable hip pads and handlebars let every user dial in the correct starting position — proper hip height and grip placement locked in before the first rep, keeping spinal alignment safe and the movement pattern repeatable across an entire session.

Primary muscles targeted

Erector Spinae Glutes Hamstrings

Secondary muscles

Adductors Core

Key features

200 lb Selectorized Weight Stack
Pin-select resistance up to 200 lb — a heavier ceiling than the standard model, supporting advanced athletes running high-load posterior chain programming.
Adjustable Hip Pads & Handlebars
Both the hip pad height and handlebar position adjust independently — locking every user into correct spinal alignment regardless of torso length or build.
Smooth, Controlled Motion
The resistance path follows a natural extension arc with consistent tension throughout — clean mechanical loading on the posterior chain from bottom stretch to full extension.
Barbell Resistance Option
Users can hold a barbell across the upper back to add resistance beyond the weight stack — extending the loading range for advanced athletes who have outpaced selectorized limits.
Heavy-Duty Commercial Frame
Built for high-frequency commercial use — handles daily high-load training in professional facilities and serious home gym setups without compromise.

Specifications

Dimensions (L × W × H)
48" × 39" × 62"
1219 × 991 × 1575 mm
Machine Weight
597 lb
271 kg
Weight Stack
200 lb
91 kg · Pin-select selectorized
Condition
New
Commercial performance standard
Adjustability
Hip Pads & Handlebars
Independent adjustment for correct alignment across all body sizes
BUILT Strength Infinite Series Back Extension (New) | CTX Home Gyms