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.

A major concern with balance and joint-stabilization exercises is to avoid potentially dangerous movements that depend on the preparedness of the athlete or patient and on the state of the healing tissue. Learn about progressions that minimize risk to the athlete or patient.

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

This article presents information about assessing speed and agility in a controlled environment with a test that is similar to the actual demands of a specific sport.

This article will provide some conditions and standards with specific tools personal trainers may consider using in their initial interview with potential clients.

National Strength and Conditioning Association (NSCA) Fellows are an accomplished group of professionals whose frequent and sustained contributions to the profession have promoted the goals and activities of the NSCA. The purpose of the Fellowship is to promote excellence and leadership within the NSCA by recognizing high standards and extraordinary professional development.

After fifteen years with the Denver Nuggets, Felipe Eichenberger has witnessed the evolution of National Basketball Association (NBA) performance firsthand. The demands of an NBA season include 82+ games, relentless travel, and the challenge of staying fresh through it all. Eichenberger reveals their post-game lifting culture, driven by the philosophy: “If it’s a hard day, let’s make it hard.” Prioritizing compliance over hardware, he emphasizes flexible periodization and nailing the basics to meet each player’s needs — whether navigating injuries, tailoring programs to position demands, or microdosing training for longevity. At the heart of it all is buy-in, trust, and accountability. Eichenberger shares the importance of leveraging psychology, getting top players to set the tone for the team, and balancing consistency with creativity. With more jobs and awareness in NBA strength and conditioning than ever, this episode explores how to make an impact at basketball’s highest level. Connect with Felipe on Instagram: @eichbra and LinkedIn:@felipe-eichenberger | Find Eric on Instagram: @ericmcmahoncscs and LinkedIn: @ericmcmahoncscs Learn more about the National Basketball Strength and Conditioning Association (NBSCA), the Official Basketball Partner of the NSCA.

Hydration, footwear, and exercise frequency are only a few of the essentials to safe participation in cardiovascular activity. Make sure to include all six essentials in your program to ensure safe participation.

Trainer Tips are infographics designed to help you, an NSCA professional, educate clients and promote your services. These member-only resources can be used for client education, motivation, and promotion.

Athletes in field and court sports require reactive agility—they must accelerate, decelerate, and change direction in a constantly changing environment. These requirements result in technical differences between sprinting in a field or court sport and sprinting the 100-m.