Power Clean

The power clean is an Olympic weightlifting derivative in which the barbell is pulled from the floor and caught on the anterior shoulders in a partial squat (≥90° knee flexion). It is the most widely programmed catching derivative in athletic conditioning, training explosive triple extension — simultaneous hip, knee, and ankle extension at peak velocity.

Execution

1. Setup: Feet hip-width, bar over mid-foot. Hips below shoulders, shoulders over or slightly in front of bar. Neutral spine, 120° hip flexion, elbows fully extended, pronated hook grip just outside the knees.
2. First pull (floor to knee): Drive hips and knees simultaneously; maintain constant back angle. Bar stays against the shins.
3. Transition (double-knee bend): As bar passes the knees, knees re-bend and hips push forward; torso angle becomes more upright.
4. Second pull (triple extension): Forceful simultaneous extension of hips, knees, and ankles; shrug at full extension.
5. Catch: Elbows rotate rapidly under the bar; receive in front-rack position — elbows high and parallel to floor, bar resting on anterior deltoids, ≥90° knee flexion.
6. Recovery: Extend hips and knees to standing; lower bar under control.

What the EMG Data Shows

The pull phase is dominated by vastus lateralis (VL) and gluteus maximus (GM). Beginners at 50% 1RM: VL 164% MVIC, GM 125% MVIC. Elite athletes at the same relative load: VL 324% MVIC, GM 299% MVIC — reflecting superior motor unit synchronisation rather than greater absolute force.

Critically, VL and GM activation is statistically equivalent between the power clean and the clean pull at loads ≥70% 1RM (Geisler 2023). The pulling phase produces an identical concentric extension stimulus whether or not a catch follows. The catch adds eccentric stabilisation demand on the wrist, elbow, and shoulder girdle — not additional triple-extension power.

VL activation at elite level does not increase monotonically from 70% to 90% 1RM (248 → 249% MVIC), suggesting motor efficiency plateaus at high expertise and that load increases beyond ~70% produce diminishing neuromuscular returns for the pull.

Front-Rack Mobility Requirements

The catch position requires specific mobility cut-points that are frequently under-screened. Deficits force the bar onto the anterior deltoid or clavicle, creating wrist and elbow torque and causing the fingers to release:

• Shoulder flexion: ≥173°
• Shoulder external rotation: ≥107°; internal rotation: ≥89°
• Elbow flexion: ≥135°; pronation: ≥90°
• Wrist extension: ≥90°

Variations

Variation	Key difference	Best for
Hang power clean	Starts from mid-thigh or knee	Learning the second pull; reduced first-pull complexity
Clean (full)	Catch in full squat	Maximising load; competitive weightlifting
Clean pull	No catch phase	Overload training; athletes with restricted front-rack mobility

For system-specific training applications, see each system's lens entry.