The Certified Performance and Sport Scientist (CPSS) is a practitioner with training and applied experiences across the scientific disciplines applicable to sport science and athletic performance (i.e., generalist) or predominantly within a select few (i.e., specialist). These scientific disciplines, as related to sports performance, include, but are not limited to: biomechanics, data science, nutrition, physiology, psychology, research methods, and strength and conditioning. A CPSS demonstrates competency in the application of scientific disciplines, assessment, training theory and process, needs analysis, monitoring, communication, and education with the primary goal of safely and effectively improving athletic performance.

Hear from Lacey Jahn, Head Strength and Conditioning Coach for the United States Marine Corps East School of Infantry. Jahn shares her unusual path into strength and conditioning with NSCA Coaching and Sport Science Program Manager, Eric McMahon, including stops in curriculum development and working as a lifeguard. Learn more about tactical strength and conditioning jobs, athletic qualities as they relate tactical performance in the military, and the how to approach attending strength and conditioning education events as a young coach. You can reach out to Lacey on Instagram: @laceylyrla | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs

This article is part of a continuing series of tactical strength and conditioning (TSAC) research reviews. It is designed to bring awareness to new research findings of relevance to tactical strength and conditioning communities.

This excerpt from Developing the Core briefly defines closed- and open-chain exercises and their respective roles in training.

Concurrent training (CT), which combines resistance exercise and energy systems conditioning, is the default approach to preparation in high-intensity intermittent (“stop and go”) team sports. This review provides an overview of CT, emphasizing its complexities and challenges in managing fatigue and optimizing performance. These complexities are specifically compounded by the variability in game demands across the season, where the presence of intensified and nonintensified competition periods necessitates a flexible and adaptive training approach. In this context, there are essential training variables to consider, including intensity, volume, session order, and recovery intervals between sessions. In addition, nontraining variables such as travel, sleep, and nutrition play a role in the fatigue experienced while training and competing. These variables interact to influence acute performance and training adaptations and can be strategically adjusted by strength and conditioning practitioners. The aim of this review is to provide a comprehensive understanding of fatigue management for practitioners in team sports, emphasizing the complexities and challenges of CT and offering simplified practical recommendations for adjusting training variables within any given microcycle.

Choose your 2026 NSCA Fall Performance Summit from two focused strength and conditioning events. Earn 0.8 CEUs with expert continuing education.

Brett Bartholomew, founder of the performance coaching and consulting company, The Bridge Human Performance, talks to the NSCA Head Strength and Conditioning Coach, Scott Caulfield, about learning what drives people, how to interact effectively with others, adapting to change, and the value in learning from other fields.

Explore 2027 NSCA Tactical Annual Training in San Antonio and online, August 23–26, for tactical strength and conditioning education. See 2026 highlights.

NSCA-certified? Learn how to keep your certification, share your credentials, earn CEUs, grow your skills, and build a rewarding strength & conditioning career.