Just Fly Performance Podcast

JB Morin on Horizontal Sprint Forces in Running Velocity and Injury Risk Reduction

23 Dec 2021

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Today’s show welcomes back JB Morin. JB Morin is currently full professor and head of sports science and the physical education department at the University of Saint-Etienne. He has been involved in sport science research for over 15 years, and has published over 50 peer-reviewed journals since 2004. JB is a world-leading researcher on all things sprint related, having collaborated with and analyzed some of the world’s best sprinters, such as Christophe Lemaitre. JB also does lots of sprint research that is highly applicable to team sport settings, such as information that can be gleaned from force-velocity profiling. He has been a 2x previous guest on this podcast, speaking on elements of heavy sled training, force-velocity profiling, and much more. When it comes to sprinting from point A to point B, the time on the clock does not necessarily represent the strategy an athlete used to get there. Athletes who can direct their sprint forces in more of a horizontal vector are going to be able to reach higher top velocities, and be more resilient towards injury. The question then becomes, how do we assess, and train athletes in respect to the direction they are producing sprint forces? In today’s episode, JB speaks on how the specifics of an athlete’s force production (in the horizontal vs. vertical direction) will highlight elements of how fatigued that individual is, and their predisposition to injury in the short term. JB also goes into how to measure force production in sprinting, new research on joint actions in early and late acceleration, hill training vs. sleds, hamstring research, and more. Today’s episode is brought to you by SimpliFaster, Inside Tracker, and Lost Empire Herbs. For 25% off of an Inside Tracker order go to info.insidetracker.com/justflysports For 15% off your Lost Empire Herbs order, head to lostempireherbs.com/justfly. View more podcast episodes at the podcast homepage. Timestamps and Main Points 5:00 – Some new work that has come out in sprint research recently, showing the importance of the hip and ankle outputs in sprinting, even in the first few steps of acceleration 16:20 – Thoughts on sprint technique, or force-velocity profiling and how that might link to potential injury in team sport situations 24:00 – The relationship (and differences) between one’s maximal horizontal force, and their maximal sprint speed, and what it means for injury risk 30:50 – How having a poor maximal horizontal force output can show up in the biomechanics of how an athlete is sprinting 37:15 – How elite athletes will start to change their force-production orientation (less horizontal, over time) once fatigue starts to set in during a training session 45:00 – How hill training compares to heavy sled training in terms of forces and velocity 50:30 – New studies and thoughts on hamstring injury in athletics 54:20 – Thoughts on training the feet and lower leg for the sake of sprinting 58:40 – JB’s thoughts on how to set up good research on sprinting in athletics “75% of the energy that is generated to run is generated at the hip and calf level” “Team sport is so chaotic, it’s the worst way to assess an athlete’s acceleration capability, the game environment is not reproducible” “Our studies show that pre-season maximal force output is not related to (injury risk) but when you measure that maximal force output throughout the season, the last measurement is related to the risk of injury in that measurement period” “You need to measure (force/velocity) regularly, not only in the pre-season period… there are so many changes throughout the season” “You can have people with the same 25 meter splits, but different profiles at the beginning of the spectrum or the end of the spectrum” “If you take two athletes with the same magnitude of ground reaction force, the best in acceleration will be the most horizontally oriented vector” “The last studies a-posteriori connected very clearly (horizontal force output) to the hamstring and glutes muscle function capability” “If you are more quad dominant, and push vertically, you will not go to a very high top speed” “I’ve seen some professional rugby players coming back from a few (off) days or weeks, because of an injury, and sprinting (pr’s), because they were chronically overloaded” “Most of the sprint related (hamstring) injuries, occur at high speeds, but also in linear movements” About JB Morin Jean-Benoit (JB) Morin is currently full professor and head of sports science and the physical education department at the University of Saint-Etienne. He was formerly full Professor at the Faculty of Sport Sciences of the University of Nice Sophia Antipolis (France), and has been involved in sport science research for over 15 years, and has published over 50 peer-reviewed journals since 2004. He obtained a Track & Field Coach National Diploma in 1998 and graduated in Sport Science at the University of Besançon, France in 2000. He obtained his PhD in Human Locomotion and Performance in 2004 at the University of Saint-Etienne, France (Prof. Alain Belli), in collaboration with the University of Udine, Italy (Prof. Pietro diPrampero). JB’s field of research is mainly human locomotion and performance, with specific interest into running biomechanics and maximal power movements (sprint, jumps). He teaches locomotion and sports biomechanics, and strength training and assessment methods. JB’s has collaborated with French sprinter Christophe Lemaitre and his group/coach, and he is member of the French Soccer Federation research group, teaching professional coaches about sprint mechanics and training for acceleration. He also collaborates with New-Zealand professional and national rugby teams, and with professional soccer clubs in France and Spain. He practiced soccer in competition for 10 years, practiced and coached track and field (middle distance and 400m hurdles) for 8 years, and he is now enjoying trail running, road cycling and triathlon.

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13:00H | 21 DIC 2025 | Fin de Semana

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12:00H | 20 DIC 2025 | Fin de Semana

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2ª PARTE | 06 ENE 2026 | EL PARTIDAZO DE COPE

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3ª PARTE | 22 ENE 2026 | EL PARTIDAZO DE COPE

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3ª PARTE | 04 MAR 2026 | EL PARTIDAZO DE COPE

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Just Fly Performance Podcast

JB Morin on Horizontal Sprint Forces in Running Velocity and Injury Risk Reduction

This episode hasn't been transcribed yet

Other recent transcribed episodes

13:00H | 21 DIC 2025 | Fin de Semana

10:00H | 21 DIC 2025 | Fin de Semana

12:00H | 20 DIC 2025 | Fin de Semana

2ª PARTE | 06 ENE 2026 | EL PARTIDAZO DE COPE

3ª PARTE | 22 ENE 2026 | EL PARTIDAZO DE COPE

3ª PARTE | 04 MAR 2026 | EL PARTIDAZO DE COPE

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