Considering the great popularity of eccentric-based training, the purpose of this review is to first provide the scientific rationale for its use; second, summarize the eccentric-based training modalities that can be used; and finally, offer practical recommendations on how to implement eccentricbased modalities to enhance sports performance. The molecular and neural mechanisms underlying eccentric actions are partially distinct from those of concentric and isometric actions. During eccentric actions, theories suggest a strain-induced modulation of actin-myosin interactions at the crossbridge level, activation of structural protein titin, and winding of titin on actin. Eccentric acute physiological responses differ from concentric exercise responses, including variations in neuromuscular, metabolic, hormonal, and anabolic signaling. Eccentric training elicits greater improvements in muscle strength, power, and stretch-shortening cycle function compared with concentric-only or traditional resistance training. Therefore, eccentric-based training can lead to unique neuromuscular (e.g., improved coordination of motor units) and morphological (e.g., increased muscle fascicle length and enhanced distal cross-sectional area) adaptations that could play a key role in sport performance. Practitioners may implement eccentric exercises with external loads, fully eccentric-based exercises (e.g., Nordic hamstring curl), accentuated eccentric loading, flywheel resistance exercise, and plyometrics to develop specific physical adaptations in line with their goals. Eccentric work (e.g., for hamstrings) can be obtained during other exercises such as downhill running tasks, decelerations, and sprinting activities. Practitioners need to be aware that no single “silver bullet” training modality exists; consequently, practitioners should use a combination of eccentric-based training approaches with their athletes to obtain the desired adaptations.

The purpose of this article is to discuss the different opinions regarding the validity of early sport specialization as opposed to diversification, specifically the effect these two methods have on injuries, motor development, skill acquisition, and social and psychological aspects.

Make the most of your membership by engaging with others through one or more Special Interest Groups (SIGs).

Position statements are official statements of the NSCA on topics related to strength and conditioning and exercise science. All NSCA Position Statements are published in the Journal of Strength and Conditioning Research® and free to the public.

In this article, personal trainers and strength and conditioning coaches will learn how Football Club of Mumbaikars has worked to maintain and even improved the fitness profile of its athletes using this online training protocol, and provide a template for how to apply this protocol to the general population.

Learn why the NSCA has joined the Smart Heart Sports Coalition to advance emergency action plans, AED access, and CPR training that save young athletes’ lives.

What's behind enduring success at the highest level of college athletics? Kate Smith, Head Strength and Conditioning Coach at the University of Michigan, shares insights from nearly 14 years of experience coaching multiple sports in a competitive collegiate environment. Smith emphasizes sustained excellence through adaptability, genuine curiosity, and openness to opportunities — even outside of athletics. Drawing on her private-sector experiences, she explains how diverse roles helped shape her flexible, athlete-centered philosophy. Smith candidly addresses current collegiate challenges, including navigating Name, Image, and Likeness (NIL) distractions and adjusting motivational strategies across team cultures and generations. As a Certified Performance and Sport Scientist® (CPSS®), Smith highlights how integrating data-driven insights helps her create a more effective training environment. This expertise uniquely positions her to bridge athletics with academics, deepening collaboration on campus-wide performance initiatives. Learn how to implement practical strategies for keeping athletes engaged amidst external pressures, leverage performance data meaningfully, and continually refresh your coaching approach. Connect with Kate via email at kannehay@umich.edu and on Instagram: @katehaycock | Find Eric on Instagram: @ericmcmahoncscs and LinkedIn: @ericmcmahoncscs

Christina Rasnake, Director of Sport Science and Analytics at the University of Delaware, talks to the NSCA Coaching and Sport Science Program Manager, Eric McMahon, about the budding future of sport science in college athletics. Topics under discussion include the staffing of sport science initiatives, effective communication across departments, and how technology and wellness surveys can support actionable change in the coaching process. Find Christina on Twitter: @Coach_Raz26 | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs