Sam Melendrez, full-time strength and conditioning coach for Discovery Canyon Campus High School, talks to the NSCA Coaching and Sport Science Program Manager, Eric McMahon, about the value of strength and conditioning coaches at the high school level. Topics include advice for those who are interested in strength training youth and high school athletes, programming fundamentals, and the value of applying classroom management skills in the weight room. Find Sam on Twitter: @sammelendrez2 | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs

The purpose of this article is to provide personal trainers with a review of common muscle extensibility tests of the lower extremity.

Collecting data can be trial and error, but by building a solid foundation prior to data collection and putting the appropriate people and procedures in place, the tactical facilitator can minimize errors while optimizing effort, money, and time.

Given their ability to discern physiological and technical aspects of a job task, TSAC-Fs may be able to collect some vital information that will assist with the underlying evidence to build the foundation of a physical abilities test.

Not all smoothies are made the same, and due to the nature of process (i.e., mixing of ingredients), oftentimes the nutritional information provided may not be exactly reflected

Decompressing after a workout, practice, or competition is a beneficial habit that can be achieved through breathing. This article provides an overview of the autonomic nervous system and guidelines for how to use breathing to calm, or balance, the brain and body.

The purpose of this article is to discuss caffeine use in tactical populations and provide recommendations for responsible consumption.

An evidence-based movement assessment could hold Marines accountable for mobility and stability by systematically assessing movement patterns. This article (part three of a four-part series) explains one way that this could be accomplished.

This is an excerpt from NSCA's Essentials of Sport Science by NSCA -National Strength & Conditioning Association, Duncan N. French & Lorena Torres-Ronda.

The third and final article in this series will introduce the practical and technical elements of heart rate variability (HRV) monitoring in greater depth and detail.