Acceleration in Sprints
- Rajesh Ananthraman
- Sep 26
- 17 min read
Application 2
Rajesh Ananthraman
Technical Skills – (Chosen Topic - Acceleration in Sprints)
Master of Science - Kinesiology (Coaching)
Kins – 7135 - Sport Coaching Pedagogy (Fall 2025)
Dr Charles Wilson
21 Sept 2025
Technical Skills – Acceleration in Sprints
Key elements that influence acceleration include:
Force application: The sprinter must apply force efficiently into the ground in a backward and downward direction.
Stride length and frequency: Both must increase in a balanced manner as the sprinter gains speed.
Posture and mechanics: Maintaining a forward lean, driving the knees, and using powerful arm movements are critical.
Importance of early phase sprint development:
The early phase of sprinting: often referred to as the acceleration phase—is critical for overall sprint performance, especially in short-distance races like the 100m or 60m. This phase covers the first 10 to 40 meters of the sprint and sets the foundation for reaching and maintaining top speed. The key reasons why early phase sprint development is important:
Start Determines Race Outcome - In short sprints, races are often won or lost in the first few seconds. A strong start provides a competitive edge by putting the sprinter in a leading position early.
Builds Momentum Toward Top Speed - Effective acceleration is essential for transitioning smoothly into the maximum velocity phase. Without, a powerful early phase, it’s difficult to reach or maintain top speed efficiently.
Maximizes Force Production - The early phase is where sprinters can exert the most force into the ground. Training this phase enhances explosive strength, helping athletes push off more powerfully from the blocks.
Improves Running Mechanics - Proper development reinforces good sprinting habits: low heel recovery, forward shin angles, and strong-arm drive. It also reduces the risk of injury by promoting biomechanically sound movement patterns.
Essential for Multi-Sport Athletes - In sports like football, rugby, or basketball, quick short-distance acceleration is often more important than top-end speed. Developing, this phase improves overall agility and explosiveness in game situations.
The Science of Acceleration
Force application
Newton's laws in sprinting
Ground reaction forces
The Science of Acceleration in Sprinting
Acceleration in sprinting is deeply rooted in physics and biomechanics. Understanding how force is applied, how Newton’s laws govern motion, and the role of ground reaction forces helps athletes and coaches train more effectively for explosive starts and efficient movement.
Force Application - Force application is the foundation of acceleration. In sprinting, it's not just about how much force an athlete produces, but how and where they apply it.
Key Point: Effective acceleration depends on optimizing both the magnitude and direction of applied force.
Newton’s Laws in Sprinting - Newton’s Three Laws of Motion directly apply to every phase of a sprint:
First Law – Law of Inertia - A sprinter remains at rest until acted upon by an external force (starting block push-off), Overcoming inertia in the first few steps is critical for rapid acceleration.
Second Law – F = ma (Force = mass × acceleration)
Third Law – Action = Reaction
Ground Reaction Forces (GRF)
Ground Reaction Force is the force the ground exerts back on the sprinter in response to their push-off.
Sprinting Phases Overview
Time vs. Speed (Graph)
Acceleration Phase (0–40 meters)
Duration: Start to ~40 meters (varies by athlete)
Objective: Overcome inertia and build speed
Posture: Forward lean, explosive knee drive, powerful ground contact
Key Traits: a) High force application, b) Gradual rise in torso, c) Powerful horizontal ground reaction forces
Stride: Short, rapid, increasing in length and frequency
Maximum Velocity Phase (40–60 meters)
Duration: ~40 to 60 meters
Objective: Reach and maintain top speed
Posture: Upright, tall stance
Key Traits: a) Minimal ground contact time, b) Maximal turnover and flight time, c) High coordination and elasticity
Stride: Long and quick, with optimal stride frequency and efficiency
Deceleration Phase (60–100 meters)
Duration: After peak speed (~60m onward)
Objective: Minimize loss of speed
Key Traits: a) Slight drop in velocity due to fatigue, b) Efficiency and relaxation are key, c) Deceleration is unavoidable, elite sprinters just delay and reduce it
Posture: Attempts to remain upright and relaxed
Velocity vs Time Graph for a 100m sprint:
Summary Table
Strength Training for Acceleration
Weight Training - Heavy resistance training builds maximal strength, especially in the lower body muscles responsible for powerful sprinting (glutes, hamstrings, quads, and calves). This forms the foundation for acceleration.
Plyometrics - It trains the stretch-shortening cycle (SSC) and enhance rate of force development (RFD), which is essential for rapid ground contact and explosive movements
Sprint-Specific Strength - This refers to drills and resisted movements that mimic the exact force patterns and joint angles used in sprinting, especially during acceleration.
Methods:
Hill Sprints
Natural resistance increases demand on glutes and hamstrings.
Encourages powerful knee drive and shorter ground contact time.
Isometric Wall Drives
Develop force application in specific joint positions (especially shin angles).
Improves neuromuscular activation and posture.
Sprint Drills with Resistance Bands
Adds resistance to sprint patterns (e.g., A-skips, marches).
Programming Tips: Keep resisted sprint distances short (10–20m) to avoid compromising mechanics. Use resistance that allows the athlete to maintain good form and high force output.
Reinforces technique under load.
Integrating All Three Components
Note: Coordination with sprint training is key—avoid overloading the CNS (central nervous system) with too many high-intensity sessions back-to-back.
Sprint Drills for Acceleration
Developing acceleration isn't just about raw power, it's about training technique, rhythm, and force direction. Sprint drills improve coordination, posture, and muscle activation, while resisted sprints and sled work help translate strength into forward speed.
key sprint drills for acceleration:
A-Skips & B-Skips
These classic sprint drills improve leg mechanics, rhythm, and neuromuscular coordination, essential for efficient acceleration.
A-Skips
Purpose: Reinforces knee drive, dorsiflexion, and posture.
How to Perform:
Skip forward while lifting the knee to hip height.
Maintain an upright torso and active arm swing.
Emphasize snapping the foot down and back under the hip.
B-Skips
Purpose: Trains leg extension, hamstring activation, and stride mechanics.
How to Perform
Start like an A-skip but extend the leg forward before pulling it down.
Mimics the recovery and striking phase of sprinting.
Sled Pushes / Sled Drags
Sled work is one of the most effective resisted sprint drills for building horizontal force production—the key to fast acceleration.
Sled Pushes
Purpose: Reinforces forward lean, powerful leg drive, and force direction.
How to Perform:
Lean forward at ~45° angle and drive the sled using strong, piston-like strides.
Keep hips low, back flat, and head neutral.
Sled Drags (with harness)
Purpose: Improves posterior chain strength in sprint-specific motion.
How to Perform:
Attach a harness or belt and sprint forward while dragging a weighted sled.
Maintain good sprinting mechanics.
Resisted Sprinting - Used to overload the sprint mechanics, improving stride length, stride frequency, and rate of force development.
Types of Resisted Sprinting:
Band-Resisted Sprints: A partner or anchored band provides resistance.
Hill Sprints: The incline forces the athlete to push harder and maintain posture.
Parachute Runs: Resistance increases with speed, helping with over-speed mechanics.
How to Program:
Summary: Benefits of These Drills
Sprint Mechanics
Posture, Arm Action, Stride Frequency and Length
key components:
Posture - is the foundation of sprinting. It affects how efficiently force is applied to the ground and how well the sprinter can maintain balance and rhythm. Key Characteristics:
Acceleration Phase:
Body leans forward at ~45° angle.
Straight line from head through hips and rear leg.
Chin tucked slightly, eyes focused ahead—not up.
Maximum Velocity Phase:
Body becomes more upright (~85–90°).
Hips high, spine neutral.
Core engaged to maintain stability.
Common Mistakes:
Overarching the lower back.
Collapsing chest or “sitting” posture.
Looking up too early during acceleration.
Arm Action - Arm movement balances and coordinates the lower body, contributing to rhythm, balance, and force application. Key, Principles:
Elbows bent at ~90°.
Arm swing from the shoulder, not just the elbow.
Front arm: hand comes to just above chest height.
Back arm: hand travels behind the hip, not too far out.
During Phases:
Acceleration:
Aggressive, powerful swings.
Helps generate momentum out of the blocks.
Max Velocity:
More rhythmic, relaxed.
Arms drive the legs and help maintain turnover.
Common Mistakes:
Cross-body swinging (wastes energy).
Overstriding arms (too high or too low).
Tense shoulders or fists (causes fatigue).
Stride Frequency & Stride Length
Speed = Stride Length × Stride FrequencyOptimal sprinting comes from finding the right balance — not just longer strides, and not just faster ones.
Stride Frequency
Refers to how quickly you cycle your legs.
Trained through drills, plyometrics, and resisted sprints.
Improved by:
Neuromuscular training
Reaction drills
Maintaining posture and ground contact timing
Stride Length
Refers to how far each stride travels.
Comes from explosive power, flexibility, and proper mechanics.
NOT achieved by overstriding, which increases braking forces.
Key Points:
Common Mistakes:
Overstriding (landing too far in front of the centre of mass).
Too much frequency without power (legs move fast but cover little ground).
Summary: Key Elements of Sprint Mechanics
Top of Form
Bottom of Form
Starting Techniques in Sprinting
Block starts
Standing vs. 3-point starts
Reaction time improvement
Block Starts
Key Elements of a Block Start:
Technical Tips:
Standing vs. 3-Point Starts
These are alternative starting techniques often used in training or in sports like football, rugby, and basketball, where a block start isn’t feasible.
Standing Start
Used for beginners or sport-specific drills.
Easier to learn, less technical.
Allows for focus on reaction and acceleration mechanics.
3-Point Start
Commonly used in training and in sports (e.g., football).
One hand on the ground, back leg staggered behind front leg.
Simulates block start angles without actual blocks.
Comparison Table:
Reaction Time Improvement
Reaction time is the interval between the starting signal (gun or cue) and the first movement. Elite sprinters average ~0.13–0.15 seconds. Drills to Improve Reaction Time:
Sound-Cue Starts
Use a whistle, clap, or audio cue.
Partner or coach varies timing to prevent anticipation.
Light Reaction Drills
Use apps or reaction lights (e.g., BlazePods, Freelap).
Athletes react visually to a flash instead of a gun.
Partner Drop Drill -Partner holds a tennis ball or small object; athlete sprints as soon as it’s dropped.
Resistance-Release Drills
Athlete starts with slight band resistance, and the band is released on cue—training explosive reaction with resistance.
Coaching Tips:
Focus on reacting to the sound, not anticipating it.
Train reaction time when fresh, not when fatigued.
Reaction time training should be short and sharp, not overused.
Summary: Key Takeaways
Mobility and Flexibility
Dynamic warm-ups
Hip and ankle mobility
Injury prevention
key components:
Dynamic Warm-Ups
Dynamic warm-ups prepare the body for high-speed movement by increasing core temperature, joint mobility, and neuromuscular readiness.
Examples of Dynamic Warm-Up Drills:
Duration: 10–15 minutes, Goal: Break a light sweat, loosen up joints, and prepare muscles for power output.
Hip and Ankle Mobility - The hips and ankles are two critical joints in sprinting. Limitations here reduce stride length, affect force direction, and increase injury risk.
Hip Mobility
Why it's important:
Allows for high knee lift and full hip extension during sprinting.
Tight hip flexors = anterior pelvic tilt = poor posture and hamstring overload.
Key Drills:
World’s Greatest Stretch (lunge + rotation)
Hip CARs (Controlled Articular Rotations)
90/90 hip transitions
Kneeling hip flexor stretches with overhead reach
Ankle Mobility
Why it's important:
Impacts dorsiflexion during ground contact and push-off mechanics.
Poor ankle mobility leads to compensations (e.g., overstriding, heel striking).
Key Drills:
Knee-to-wall ankle mobilizations
Banded ankle distraction (posterior glide)
Toe-elevated calf stretches
Foot rolls / soft tissue massage (plantar fascia, Achilles)
Injury Prevention Through Mobility
In sprinting, common injuries include hamstring strains, hip flexor tightness, and Achilles issues. Mobility and flexibility help reduce these risks by:
Ensuring full range of motion during sprint mechanics
Reducing compensatory movements (e.g., overextending the spine due to tight hips)
Keeping soft tissues elastic and responsive
Tips for Injury Prevention:
Never skip your warm-up - cold muscles are stiff muscles.
Use mobility as a cooldown tool, too (static stretching, foam rolling).
Address tight areas proactively, not reactively.
Pair mobility with activation drills to “lock in” improved range (e.g., after hip mobility work, do glute bridges or sprint drills).
Summary Table
Sample Acceleration Training Program
Weekly plan
Sets, reps, and rest
Periodization tips
Goal: Improve acceleration through sprint technique, power development, and sprint-specific strength.Athlete Level: Intermediate (2+ years of sprint or athletic training)Focus Areas: Sprint mechanics, resisted sprints, strength & power, recovery
Weekly Acceleration Training Plan (3 Days/Week Sprint Focus)
Sample Weekly Plan: Details
Monday – Sprint Drills + Acceleration Mechanics
Warm-Up (15 mins) - Dynamic mobility drills (leg swings, lunges, skips),A-skips & B-skips (2x20m), Bounding (2x20m)
Acceleration Drills
Strength Training – Lower Body
Wednesday – Resisted Acceleration + Plyometrics
Warm-Up (15 mins) - Dynamic drills + ankle/hip mobility, Fast-feet drills, activation band work
Resisted Sprints
Plyometrics
Core + Mobility - Side planks, bird dogs, dead bugs, 3 rounds, Hip/ankle mobility cool down (10 mins)
Friday – Sprint Mechanics + Power
Warm-Up - A-skips, B-skips, straight-leg bounds (2x20m),Resisted marches (bands or sled)
Sprint Work (Unresisted)
Power Training (Olympic Lifts or Alternatives)
Programming Notes
Sets, Reps, and Rest Summary
Sprints: Short distances (10–40m), 3–6 sets, long rest (1.5–3 min) for full recovery.
Strength: 3–5 sets of 3–6 reps at 75–90% 1RM.
Plyos: Low volume, 3–5 sets, full rest. Focus on explosiveness, not fatigue.
Periodization Tips (4–6 Week Cycle)
Week 1–2: Base & Mechanics Focus
Emphasize sprint form, controlled sled work, and technique.
Moderate loads and volume.
Week 3–4: Load & Intensity Buildup
Increase sled resistance, weightroom intensity.
Slightly reduce sprint volume to maintain quality.
Week 5–6: Speed & Taper
Drop resistance, increase unresisted sprint speed.
Focus on max effort starts, lighter strength work, and full recovery.
Summary
Conclusion and Resources
Key takeaways
External resources (books, videos, research)
External Resources for Further Learning
Books
NSCA's Developing Speed – Human Kinetics ( Excellent for fundamental, and Programe designing
“The Anatomy of Speed” by Bill Parisi ( Good for learning about Mobility and unique fascia training)
“Sprint Faster” by Brian MacKenzie & Lee Taft (Great for acceleration drills and technique.)
“High-Performance Sprinting” by Michael Yessis (Focuses on biomechanics and training principles)
“Science of Sprinting” by John Kiely (Covers physiology and neuro mechanics in sprinting)
YouTube Channels:
The Sprint Doctor — Detailed sprint mechanics breakdowns.
Coach Lee Taft — Acceleration and speed development tutorials.
Athlete Assessments — Mobility and injury prevention exercises.
Research Papers:
“Biomechanical Analysis of Sprint Acceleration” (Journal of Sports Sciences)
“Effect of Plyometric Training on Sprint Performance” (Strength & Conditioning Journal)
Search via Google Scholar for latest studies on sprint mechanics and acceleration.