Get NSCA’s Essentials of Tactical Strength and Conditioning, Second Edition — a trusted resource for TSAC-F® exam prep and military and public safety training.

Various methods of eccentric training that aim to increase muscle mass or reduce ground contact time during a landing task have been extensively researched and practically examined. However, multiple methods to implement eccentric training currently exist; they differ in execution and intended training adaptions. There is a clear differentiation between an eccentric muscle action and an eccentric motion whereby a motion alludes to a downward movement of an exercise. The proposed eccentric motions are dissipating eccentrics, deceleration eccentrics, overcoming eccentrics, maximal eccentrics, and rebound eccentrics. These motions formulate into training methods and cues to allow practitioners to clearly differentiate the various eccentric training methods used in research and practice. This review proposes a new conceptual framework that clearly outlines the different forms of eccentric motions that fall into a desired eccentric training method.

Meet the 2026 NSCA Peer & Special Recognition Awards recipients, who will be recognized for excellence across the profession at the NSCA National Conference.

Show your breadth of knowledge, skills, and abilities by obtaining additional NCCA-accredited certifications

Learn about the basics of the high school strength and conditioning coach profession: description, responsibilities, qualifications, pay, advantages, and challenges.

Congratulations to the NSCA's 2025 awardees for their dedication and contributions to the NSCA and the field of strength and conditioning.

Colin Wilborn and Bret Contreras are elected to the NSCA Board of Directors. Joining the Nomination Committee are Shawn Arent and Jenevieve Roper.

The TSAC-F examination reflects the most current and accepted KSA standards within the health and fitness industries. Further, the examinations may be developed from references that may be in addition to resources listed below. NSCA materials survey important content area, but are not a comprehensive study of the Exercise Sciences.

L.I.F.T. Mentorship Program Overview. The purpose of the NSCA L.I.F.T. Mentorship Program is to prepare and position students and professional members from underrepresented groups for participation in NSCA volunteer activities that will lead to increased retention, service and leadership opportunities.