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.

Dave Terry, Associate Director of Sports Performance at Georgetown University, talks to the former NSCA Head Strength and Conditioning Coach, Scott Caulfield, about his time at Georgetown and the value of mentorship. Topics under discussion include building the intern program, creating relationships with the athletes, and different ways to think creatively, learn, and grow as a strength coach. Find Dave on Instagram: @daveterry16

Kurt Hester, Head of Sports Performance at Louisiana Tech University, talks to the NSCA Head Strength and Conditioning Coach, Scott Caulfield, about his journey from weight lifting at 12 years old to training collegiate football athletes today. Topics under discussion include starting a business, pioneering strength and conditioning, and the interview process. Find Kurt on Twitter: @thekurthester or on Instagram: @hesterkurt | Find Scott on Instagram: @coachcaulfield

Casey Kramer, Assistant Strength Coach for the Chicago Bears National Football League (NFL) team, talks to the NSCA Coaching Program Manager, Eric McMahon, about working with tactical, Olympic sport, and professional football athletes. Topics under discussion include advice for young coaches, scheduling strength and conditioning sessions in the NFL calendar, and different qualities coaches should seek to have outside of the weight room. Find Casey on Instagram: @caseykramer12| Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs

Specialist law enforcement resources are under constant strain to maintain operational and organizational outcomes. The high operational tempo disturbs many functions including skill enhancement, personal development, work/life balance, and time for physical conditioning.

This article focuses on the requirements that must be met for sailors to pass a Physical Fitness Assessment (PFA), and resources the Command Fitness Leader (CFL) and tactical facilitator have at their disposal to assist sailors. In addition, an example program is provided to help support sailors struggling to meet PFA requirements.

High chronic workloads have been shown to be associated with a reduced risk of non-contact, soft tissue injuries, while large spikes in acute training loads have been associated with an increased risk of these types of injury. Analyzing the acute:chronic workload ratio allows a coach to optimize training for the athlete and to continue in advancing fitness goals without overtraining.

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

This TSAC Report article discusses the training load of GPS technology and blood lactate monitoring for first responders. Visit NSCA online to learn more about tactical fitness.