--- id: power_snatch name: Power Snatch status: complete category: exercise pattern: [hinge] equipment: [barbell] difficulty: technical_complexity: 5 strength_prerequisite: 3 mobility_prerequisite: 5 muscles: - id: erector_spinae role: primary - id: vastus_lateralis role: primary - id: gluteus_maximus role: primary - id: multifidus role: primary - id: trap_upper role: primary - id: biceps_femoris role: secondary - id: semitendinosus role: secondary - id: rectus_femoris role: secondary - id: vastus_medialis role: secondary - id: deltoid_anterior role: secondary - id: triceps_brachii role: secondary - id: gastrocnemius role: secondary - id: soleus role: secondary - id: forearm_flexors role: stabilizer # Geisler 2023: Hang Power Snatch (HPS) across three expertise levels and two loads. # Phase: pull_and_catch — ES values include both pull and overhead catch demands. # The catch is responsible for the majority of the ES elevation vs the snatch pull. # At elite level, catch-phase ES significantly exceeds snatch pull (p < 0.05). muscle_activation_studies: - source_id: geisler_2023 doi: "10.52082/jssm.2023.778" n: 11 population: "beginners" condition: load_pct_1rm: 50 phase: pull_and_catch measurements: - {muscle: trap_upper, mean_pct_mvc: 71.69, sd: 23.21} - source_id: geisler_2023 doi: "10.52082/jssm.2023.778" n: 10 population: "advanced" condition: load_pct_1rm: 50 phase: pull_and_catch measurements: - {muscle: erector_spinae, mean_pct_mvc: 175.69, sd: 134.95} - source_id: geisler_2023 doi: "10.52082/jssm.2023.778" n: 6 population: "elite" condition: load_pct_1rm: 50 phase: pull_and_catch measurements: - {muscle: erector_spinae, mean_pct_mvc: 294.28, sd: 152.77} - source_id: geisler_2023 doi: "10.52082/jssm.2023.778" n: 11 population: "beginners" condition: load_pct_1rm: 90 phase: pull_and_catch measurements: - {muscle: erector_spinae, mean_pct_mvc: 215.68, sd: 321.69} - source_id: geisler_2023 doi: "10.52082/jssm.2023.778" n: 6 population: "elite" condition: load_pct_1rm: 90 phase: pull_and_catch measurements: - {muscle: erector_spinae, mean_pct_mvc: 371.62, sd: 271.60} joint_rom_required: hip_flexion_deg: 120 knee_flexion_deg: 90 ankle_dorsiflexion_deg: 20 shoulder_flexion_deg: 180 shoulder_external_rotation_deg: 90 shoulder_internal_rotation_deg: 70 notes: "Setup: 120° hip flexion. Overhead catch: 180° shoulder flexion, 90°/70° ER/IR required for stable lockout" source: "nasm_2020 / setpt_2020" strength_curve: type: bell_shaped sticking_point: first_pull_to_transition peak_force_position: second_pull notes: > Wider snatch grip shortens effective pull height vs clean grip, requiring greater barbell velocity to achieve a successful catch. Peak power at 45–65% 1RM. Under repeated fatiguing reps, athletes increase spinal stiffness (L5-S1 extension decreases significantly, p=0.03) to protect passive lumbar tissues — a healthy protective neural strategy. Catch-phase ES at elite level (372% MVIC at 90% 1RM) is ~76% greater than the snatch pull (212% MVIC) — the overhead eccentric stabilisation is the defining demand. source: "geisler_2023 / jsc_2013" injury_risk: joint_stress: shoulder: high wrist: high lower_back: high common_injuries: - structure: rotator_cuff mechanism: eccentric_overload_at_catch risk_factors: [insufficient_shoulder_flexion, restricted_thoracic_extension] - structure: lumbar_disc mechanism: hyperextension_during_catch risk_factors: [excessive_lordosis, poor_bracing] contraindications: - acute_shoulder_injury - lumbar_herniation variations: [snatch_pull] progressions: [overhead_squat] alternatives: [] sources: - source_id: geisler_2023 title: "Effects of Expertise on Muscle Activity during the Hang Power Clean and Hang Power Snatch Compared to Snatch and Clean Pulls" author: "Geisler S et al." year: 2023 doi: "10.52082/jssm.2023.778" credibility: rct - source_id: nasm_2020 title: "NASM Optimum Performance Training" author: "National Academy of Sports Medicine" year: 2020 credibility: expert_consensus - source_id: setpt_2020 title: "Weightlifting Series Part I: Improving Overhead Mobility" author: "Set Physical Therapy" year: 2020 credibility: practitioner --- # Power Snatch The power snatch is the snatch family's catching derivative. The barbell is pulled from the floor with a wide (snatch) grip and received overhead in a partial squat (≥90° knee flexion). It is the highest-mobility-demand movement in standard strength training, requiring 180° of shoulder flexion and stable overhead control throughout the catch. ## Execution 1. **Setup:** Feet hip-width, bar over mid-foot, wide snatch grip (roughly 1.5× shoulder width). 120° hip flexion, neutral spine. Shins and torso roughly parallel to each other. 2. **First pull (floor to knee):** Drive hips and knees; maintain back angle. Bar stays against the shins. 3. **Transition (double-knee bend):** As bar passes the knees, knees re-bend and hips push forward. 4. **Second pull (triple extension):** Explosive hip, knee, and ankle extension; shrug at peak. Wider grip requires higher peak barbell velocity than the clean grip to achieve the catch position. 5. **Catch:** Arms press out and up, receiving the bar locked overhead with elbows fully extended. Hips and knees flex to ≥90°. Requires 180° shoulder flexion to keep the bar over the midfoot. 6. **Recovery:** Stand by extending hips and knees while maintaining the overhead bar position. ## What the EMG Data Shows The defining feature of the power snatch versus the snatch pull is the massive erector spinae demand at the catch. Elite athletes at 90% 1RM show ES activation of 372% MVIC during the power snatch versus 212% MVIC during the snatch pull (p < 0.05, Geisler 2023). This ~76% difference represents the eccentric stabilisation cost of arresting a high-velocity barbell overhead — the spinal erectors must decelerate trunk extension through the catch. Under repeated fatiguing repetitions, athletes adopt a protective neural strategy: L5-S1 intervertebral extension decreases significantly (p = 0.03) as fatigue accumulates, reflecting increased spinal stiffness to protect passive lumbar tissue. Technical failure in this protective mechanism is the injury pathway. Upper trapezius (beginners, 50% 1RM: 72% MVIC) elevates the shoulder girdle during the shrug and assists in pulling the body under the bar. ## Overhead Catch Mobility Requirements These are the strictest mobility demands in strength training. Restrictions force a forward bar displacement that cannot be recovered mid-lift: - Shoulder flexion: ≥180° - Shoulder external rotation: ≥90°; internal rotation: ≥70° - Thoracic extension to maintain bar over the midfoot Shoulder flexibility correlates significantly with trunk angle at the bottom position (r = −0.67, p = 0.003): restricted shoulders force a compensatory forward trunk lean that shifts the bar forward and destabilises the catch. ## Variations | Variation | Key difference | Best for | |-----------|----------------|----------| | Snatch pull | No catch phase | Overload training (100–140% snatch 1RM); reduced shoulder demand | | Snatch (full) | Catch in full squat | Maximising load; competitive weightlifting | | Overhead squat | No pull; static overhead | Mobility screening; catch-position conditioning | > For system-specific training applications, see each system's lens entry.