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Power
Power

Sled Work (Pushes, Pulls, Resisted Marches)

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powerspeedresisted-sprintsledaccelerationconditioning

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Pushing or towing a weighted sled to add resistance to the drive phase — builds acceleration, horizontal force, and lower-body power (and conditioning at higher loads/volumes).

Detail

Sled work uses a weighted sled (or prowler) that the athlete pushes, tows (harness/belt), or marches with to add external resistance to running and the acceleration drive. It exaggerates the forward lean, long ground contact, and horizontal force application of the acceleration phase, making it a primary tool for Resisted & Assisted Sprinting and lower-body power/conditioning.

Technique: maintain the acceleration posture — body in a forward-leaning line, powerful triple-extension push of the drive leg, full strides, sharp arm action (for tows). Keep the lean and shin angle; don't let heavy loads pull the hips down or shorten steps into a "grind."

Loading is the key variable and is debated:

  • Light sleds (≈ up to ~10% of body mass, causing <~10% velocity loss) preserve near-normal sprint mechanics and bias max-velocity / speed.
  • Heavy sleds (large velocity loss, sometimes 50%+ of body mass) strongly bias acceleration, horizontal force, and strength-speed but distort mechanics the most.
optimal sled loads are an active research area; %BW and velocity-loss prescriptions vary widely between sources.

For power/speed, use short distances (~10-30 m) with full recovery; for conditioning, longer/heavier repeats with shorter rest.

Key facts

  • Push/tow/march a weighted sled to resist the acceleration drive.
  • Exaggerates forward lean, long contacts, and horizontal force.
  • Light loads (~≤10% BW) bias speed; heavy loads bias acceleration/horizontal force.
  • Keep acceleration posture; avoid loads that "grind" mechanics.
  • Power/speed: short distances + full recovery; conditioning: longer/heavier repeats.

Connections

Sources

Cited in text — not yet linked
Established exercise-science consensus; NSCA Essentials of Strength Training & Conditioning. Pages: (general consensus).

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Atlas Connections

Gluteus Maximus
The strongest, largest muscle in the body; the primary hip extensor and a lateral rotator of the femur.
Quadriceps
The four knee extensors — rectus femoris, vastus medialis, vastus lateralis, vastus intermedius (rectus femoris also flexes the hip); the leg-extension arc is ~90° (knee bent to straight).
Acceleration vs Max-Velocity TrainingClosely related
Acceleration training develops the leaning, horizontal-force "drive" phase; max-velocity training develops the upright, reactive top-speed phase — they need different drills, distances, and cues.
Resisted & Assisted SprintingClosely related
Resisted sprints (sleds, hills, bands, parachutes) overload force and acceleration; assisted (overspeed) sprints (downhill, towing) push stride frequency above normal — both used carefully to nudge speed.
Sprint MechanicsClosely related
Sprinting has two distinct phases — acceleration (driving from low and leaning) and maximum velocity (tall, cyclical, reactive) — each with its own posture and force-application pattern.
Wall Drills (Acceleration)Closely related
Lean into a wall in a rigid forward-lean position and drive the knees, teaching the body line, positive shin angle, and front-side mechanics of the acceleration phase.