Barbell Hamstring Smash in Rack for Deadlift Mobility, Low Back Relief & Better Jefferson Curls

The Ready State (Kelly Starrett)
The Ready State (Kelly Starrett)Mar 20, 2026

Why It Matters

Improving hamstring mobility with this loaded stretch can boost deadlift performance while reducing low‑back and knee strain, delivering tangible gains for strength‑training athletes.

Key Takeaways

  • Barbell hamstring smash targets medial hamstring via loaded flexion.
  • Position places knee to chest, increasing stretch and tension.
  • Enhances Jefferson curl depth and deadlift form through mobility.
  • Relieves low‑back discomfort and may improve knee alignment.
  • Exercise can be done at home; app offers guided programs.

Summary

The video introduces a barbell‑based hamstring “smash” performed in a rack, designed to flood the medial hamstrings with load while the athlete is in deep flexion. By tucking the knee to the chest and pressing the bar against the back of the thigh, the movement mimics a loaded stretch that most conventional hamstring work neglects.

The host explains that the position isolates the hamstring insertion on the pelvis, allowing practitioners to “contract, relax, get some motion” and thereby increase tissue pliability. He notes that the extra tension can translate into deeper Jefferson curls, more stable deadlift mechanics, and reduced lumbar strain, with a potential side benefit for knee alignment.

A memorable line—“Don’t be creepy, don’t do weird at the gym, put your butt all over the bar”—underscores safety and comfort. He also promotes the Mobility Coach app, which provides step‑by‑step guidance and programming for this and related mobility drills.

For strength athletes, integrating the barbell hamstring smash could unlock higher training loads, lower injury risk, and smoother movement patterns, making it a valuable addition to any mobility toolbox.

Original Description

Kelly’s “Monkey Bars of Death” — done with a barbell set at hip height in a rack — delivers deep pressure to the hamstrings and glute tie-in near the pelvis. Add knee flex/extend flossing + contract/relax for 5 minutes per side to improve deadlifts, Jefferson curls, and overall back/knee comfort.
About The Ready State:
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