The purpose of this article is to provide an introduction to contrast training, including how it is defined, what variables are utilized, and examples of how to use it in training.

Football is a high intensity collision based sport that has an inherent risk of injury in both competition and practice. The focus of ACL injuries and the development of injury prevention programs have been key in the development of youth athletes to keep them participating in sport with reduced risk of injury.

Approximately 2 million youth from 6 - 12 years of age participate in football every year. This article discusses the importance of long-term athletic development (LTAD) for youth football athletes and the significance of a player development pathway for long-term success and longevity in the sport.

This article features the recharge skate—an in-season hockey conditioning drill, designed by the authors, to maintain hockey-specific energy system fitness throughout the competitive season.

Christina Rasnake, Director of Sport Science and Analytics at the University of Delaware, talks to the NSCA Coaching and Sport Science Program Manager, Eric McMahon, about the budding future of sport science in college athletics. Topics under discussion include the staffing of sport science initiatives, effective communication across departments, and how technology and wellness surveys can support actionable change in the coaching process. Find Christina on Twitter: @Coach_Raz26 | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs

In this lecture from the NSCA's 2014 Coaches Conference, Dr. Bryan Mann addresses velocity-based training (VBT) in sports. Dr. Mann defines VBT as "the use of various devices that measure displacement and time" as he describes each device and its ability.

This excerpt from the NSCA’s Essentials of Sport Science, discusses some of the benefits and validity of Global Positioning Systems (GPS) data.

This excerpt from NSCA’s Essentials of Sport Science briefly explains the force-velocity-power profile and how it can give strength and conditioning coaches a more holistic view of athletes.

Scientific research has identified lactate threshold (LT) and maximal exercise performance as being very important contributors to endurance performance. A well-designed endurance training program can lead to improvement in both LT and maximal exercise performance within a single season and from season to season.

Alex Calder, Head of Sports Science for the Houston Dynamo Major League Soccer (MLS) team, talks to the NSCA Coaching and Sport Science Program Manager, Eric McMahon, about sports science data driving better decisions on and off the field. Topics under discussion include the importance of traditional strength training for soccer players, as well as, the variety of strength and conditioning opportunities there are to gain experience from at the high school, college, private, and professional level of sports. Find Alex on Twitter: @calder_05 or Instagram: @calder_05 | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs