Skip to content
Crucible Fit
  • The Crucible
  • The Week
  • Programs
  • Train Your Way
  • Pricing
Get Crucible
  • The Crucible
  • The Week
  • Programs
  • Train Your Way
  • Apple Watch
  • Pricing
  • FAQ
  • Training Guides
Get Crucible
Crucible Fit

A daily functional fitness test for iPhone, Apple Watch and Android. Stations, reps and the Crux, sized to your readiness and your kit.

Download on the App StoreGet it on Google Play

Crucible Fit

  • The Crucible
  • The Week
  • Programs
  • Train Your Way
  • Apple Watch
  • Pricing

Explore

  • Training Guides
  • Exercise Library
  • FAQ
  • Press
  • Support

Legal

  • Terms and Conditions
  • Privacy Policy
  • Consumer Health Data Notice

CRUCIBLE FIT™ and Crux by Crucible Fit are trademarks of Crucible Fit, LLC.

© 2026 Crucible Fit, LLC. All rights reserved. Apple, the Apple logo, iPhone and Apple Watch are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc. Google Play and the Google Play logo are trademarks of Google LLC.

  1. Home
  2. /
  3. Exercises
  4. /
  5. Core & Abs
  6. /
  7. Smith Reverse Hyperextension

Exercise guide

Smith Reverse Hyperextension

  • Intermediate
  • Compound
  • Rep-based
  • Lower legs
  • Waist

The Smith Reverse Hyperextension is a powerful posterior chain exercise that isolates the glutes and hamstrings by moving the legs against resistance while the spine remains unloaded. This variation provides a fixed path of motion, allowing for intense peak contractions and controlled eccentric phases.

Reviewed by the Crucible Fit team · Updated June 2026

Watch the Smith Reverse Hyperextension demonstrationVideo and instructions for every movement are in the Crucible Fit app.

Muscles worked

Primary

  • Glutes
  • Hamstrings

Secondary

  • Erector spinae
  • Obliques

Equipment

  • Smith machine

Setup

  1. Position a flat bench or hyperextension pad perpendicular to the Smith machine bar.
  2. Set the bar height so it rests against your lower calves/achilles when your legs are hanging straight down.
  3. Lie face down on the bench with your hip crease at the very edge, allowing your legs to hang freely.
  4. Grip the front or sides of the bench firmly to anchor your upper body.

How to do it

  1. Inhale and brace your core, then exhale as you drive your heels upward against the bar by contracting your glutes.
  2. Lift your legs until they are roughly parallel to the floor or in line with your torso, avoiding spinal hyperextension.
  3. Squeeze your glutes and hamstrings at the top for a 1-second peak contraction.
  4. Inhale as you slowly lower the bar back to the starting position using a controlled 3-second eccentric tempo.

Form checklist

  • Keep your neck neutral by looking slightly down or forward, not up.
  • Ensure the movement occurs at the hip joint, not by arching the lower back.
  • Keep your legs straight or with a very slight, fixed knee bend throughout the set.
  • Maintain constant tension by not letting the bar rest at the bottom of the rep.

Pro tips

  • Think about 'reaching' your heels toward the back wall rather than just lifting them up to maximize hip extension.
  • To emphasize the glutes over the hamstrings, slightly rotate your toes outward (external rotation) as you lift.

Make it harder

  • Add a 3-second isometric hold at the top of each rep to increase time under tension.
  • Perform the movement with a '1-and-1/4' rep style, adding a small pulse at the top of the range.

Frequently asked

What muscles does the smith reverse hyperextension work?
The smith reverse hyperextension primarily targets the glutes and hamstrings, and also works the erector spinae and obliques as secondary muscles.
What equipment do you need for the smith reverse hyperextension?
The smith reverse hyperextension uses smith machine.
Is the smith reverse hyperextension good for beginners?
The smith reverse hyperextension is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • Alternate Hamstring Curl Sky PunchIntermediate · glutes and hamstrings
  • Alternating Hamstring Curl JackIntermediate · abs, glutes, hamstrings, and quadriceps
  • Alternating Hamstring Curl Overhead ClapIntermediate · abs, glutes, and hamstrings
  • Around The World Superman HoldIntermediate · erector spinae, glutes, hamstrings, lats, and trapezius

Train it with Crucible Fit.

Every movement in this library is in the app with video and instructions, ready for your own sessions on the days between Crucibles. Your first Crucible is on us.

Download on the App StoreGet it on Google Play

See how a Crucible works