Based on the research by:
Nayel Constant1 and Jean-Benoıt Morin1 2
1Université Jean-Monnet, Département STAPS, Saint-Etienne, France
2University Jean Monnet Saint-Etienne, Lyon 1, University Savoie Mont-Blanc, Inter-university Laboratory of Human Movement Biology, EA 7424, F-42023, Saint-Etienne, France

Published at: Sport Performance & Science Reports – SPSR26

Why This Study Matters for Coaches

Resisted sprint training is a cornerstone of modern speed development, but the tools and methods used make a significant difference in both athlete safety and performance outcomes. The recent study by Nayel Constant and Jean-Benoıt Morin provides coaches with valuable insights into how the EXER-GENIE Speed Trainer™ compares with traditional sled training for resisted sprints.

Key Findings Coaches Need to Know

1. Accurate Calibration and Consistent Resistance
The EXER-GENIE Speed Trainer™ can be precisely calibrated to deliver consistent resistance, regardless of training surface or environmental conditions. This is a major advantage over sleds, which are influenced by turf, friction, and weather.

2. Clear Load-Velocity Relationships
The research confirms a predictable, linear relationship between the resistance set on the EXER-GENIE and the resulting sprint velocity. This allows coaches to fine-tune training loads for specific speed qualities (acceleration, max velocity, or power) and to reliably monitor athlete progress.

3. Comparison with Sled Training
While both modalities are effective for horizontal force production and sprint development, the EXER-GENIE offers:

  • Superior portability: No need for large spaces or heavy equipment.
  • Fine load adjustments: Resistance can be changed in small increments, allowing for truly individualized programming.

Practical Takeaways for Coaches

  • Individualize Training: Use the EXER-GENIE’s calibration guidelines to set precise loads for each athlete, targeting the desired phase of sprinting.
  • Track and Progress: Monitor sprint times and resistance settings to evaluate adaptations in force and velocity, and increase loads systematically.
  • Enhance Technique: The consistent resistance makes it easier for athletes to maintain proper sprint mechanics, even under load.
  • Versatile Application: Train anywhere—indoors or outdoors—without worrying about surface or weather conditions.

Example Session Structure:

  1. Warm-up: Dynamic drills, light resisted sprints (low load, short distance)
  2. Main Set:
    • 4–6 x 20m resisted sprints at individualized load (per EXER-GENIE calibration)
    • 2–4 minutes rest between reps
  3. Contrast Sprints:
    • 2–4 x 20m unresisted sprints to reinforce speed and technique

Why Consider the EXER-GENIE Speed Trainer™?

  • Consistency: Delivers repeatable loads for reliable tracking and progression.
  • Portability: Lightweight and compact—train anywhere.
  • Scientifically Validated: Backed by research from Di Michele et al. and trusted by elite coaches and athletes.
  • Data-Driven: Enables precise, individualized programming for all levels.

Read the Full Study

For a deep dive into the methodology, calibration charts, and detailed results, visit the official publication:
The EXER-GENIE Speed Trainer™ for Resisted Sprint Training: Calibration, Analysis of Load-Velocity Relationships and Comparison with Sled Modality (Sport Performance & Science Reports – SPSR260)

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