The importance of recognizing a closed-chain activity lies in the fact that the motions of multiple joints are coupled. Weakness at any one joint will consequently limit performance of the entire movement.

Tom Williams’ journey to Head of Performance and Sport Science for Major League Soccer (MLS) powerhouse, the Los Angeles (LA) Galaxy, began at a crossroads: pursue traditional coaching or medical pathways. As a soccer “Swiss Army knife,” he embraced early sport science alongside coaching, building a career defined by collaboration and innovation. At the Galaxy, Williams is part of a web of support that uses rich data storytelling tailored to stakeholders and players, guiding decisions and infusing value in every encounter. This system drives their three key pillars: winning championships — including their recent record-breaking sixth MLS Cup — developing a robust academy pipeline, and leading innovation. In MLS’s “cultural melting pot,” Williams balances diverse backgrounds and short-term demands like fixture congestion while employing sustainable long-term strategies. With a unique full-time cognitive department and creative approaches like dodgeball warm-ups, he combines trust and ingenuity to elevate performance and presents a blueprint for those exploring emerging sport science. Reach out to Tom on LinkedIn: @tom-williams and X/Twitter: @Williams26Tom | Find Eric on Instagram: @ericmcmahoncscs and LinkedIn: @ericmcmahoncscs Did you know MLS has a newly mandated Certified Performance and Sport Scientist® (CPSS®) role? Engage with NSCA’s Pro Sport Partner, the Professional Soccer Performance Association (PSPA), on social media to learn more: Instagram: @pspa_performance X/Twitter: @PSPA_perform LinkedIn: @professional-soccer-performance-association

Certified Strength and Conditioning Specialists® (CSCS®) are professionals who apply scientific knowledge to train athletes for the primary goal of improving athletic performance. Learn more about becoming a strength and conditioning coach with the NSCA certification! Visit NSCA.com for more information on strength and conditioning jobs, strength and conditioning internships, continuing education and CEUs.

The College Strength and Conditioning Coach of the Year Award is given to an outstanding Certified Strength and Conditioning Specialist® (CSCS) to recognize their dedication to improving athletic performance with safe and effective science-based programs.

This book excerpt reviews the psychological principal of the self-determination theory (SDT) and its role in motivation and how this can be used in a tactical setting.

In today's National Football League (NFL) world, teams are always on the lookout for the best talent. That is why strength and conditioning coaches are crucial in optimizing a prospect's value. This special episode of the NSCA Coaching Podcast features NFL Combine expert, Bryan McCall, sharing details of coaching process leading up to the event. The conversation includes co-hosts Eric McMahon, the NSCA Coaching Program Manager, and Gatorade Team Sports Manager, Jon Jost. You will hear Coach McCall credit Coach Jost as an early career mentor and emphasize the importance of mentorship for all coaches. Learn how to make a successful year-round business of strength and conditioning and advance your coaching career with an entrepreneurial mindset. You can reach Coach McCall on Instagram: @justbmac_ or Twitter: @just_BryanM | Email Jon at: jonathan.jost@pepsico.com | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs To learn more and join the Gatorade Performance Partner Community, visit GatoradePerformancePartner.com.

Matthew Nein, Head Sports Performance Coach for Salisbury University, talks to the NSCA Head Strength and Conditioning Coach, Scott Caulfield, about receiving the NSCA Collegiate Strength Coach of the Year award, personal and program values, and mental toughness.

All fitness components depend on body composition to some extent, and the demands of many sports require that athletes maintain standard levels of body composition.

Field tests have become popular in applied exercise science and sport performance enhancement programs because of their simplicity and ability to generalize results. However, numerous confounding factors may influence the validity of test data from such evaluations.

A fundamental training program at a young age gives the athlete the opportunity to develop many skills needed to succeed. The implementation of agility and coordination training can help reduce the risk of injury and elevate a young developing athlete.