This article explains Fartlek training as well as how it can be programmed and individualized for different clients.

Few strength coaches have shaped sport performance like Al Vermeil — the only strength coach to earn championship rings in both the National Football League (NFL) and National Basketball Association (NBA). In this Gatorade Performance Partner Special Episode, Vermeil shares how a career built on explosiveness, adaptability, and relentless curiosity has transformed teams at every level. From advancing plyometrics and Olympic lifts in the 1970s to creating the performance pyramid and the innovative “time machine” testing system, his methods have influenced generations of coaches and athletes worldwide. Known for blending timeless principles with fresh, actionable ideas, he explains how mechanics, group management, and collaboration create consistent results and lasting trust. Along the way, Vermeil offers rare perspectives on coaching longevity, revealing how his adaptability and curiosity have kept him learning — and lifting — into his 80s. Gain practical insights to keep explosiveness central, integrate performance science, and strengthen your long-term coaching impact. Reach out to Coach Vermeil by email at: a60vermeil@sisna.com | Email Jon Jost at: jonathan.jost@pepsico.com | Find Eric on Instagram: @ericmcmahoncscs or LinkedIn: @ericmcmahoncscs. This special episode is brought to you in part by Gatorade Performance Partner. Learn more and join their community at GatoradePerformancePartner.com.

Kayleigh Fournier, now Assistant Director of Strength and Conditioning at Dartmouth College, talks to the former NSCA Head Strength and Conditioning Coach, Scott Caulfield, about her journey from unpaid intern to head strength coach. Topics under discussion include work ethic as a young professional getting into the field, programming for unconventional sports, and diversifying your network of support. Connect with Kayleigh through email: kayleigh.fournier@dartmouth.edu

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

This excerpt from Developing the Core briefly defines closed- and open-chain exercises and their respective roles in training.

Gary Boros, Assistant Sport Performance Coach at the University of Denver, talks to the NSCA Head Strength and Conditioning Coach, Scott Caulfield, about being flexible in your programming and with your staff, not always grinding your athletes into the ground, and the need to learn from others.

Learn from a coach who took his career from working with Winter Olympic and professional sport athletes to success in the private sector. In this episode, Bret Kelly of Exos and formerly United States Ski and Snowboard, shares about his journey and the need for coaches to remain versatile in growing their professional skills in the field. Tune in as Kelly connects with Eric McMahon, the NSCA Coaching and Sport Science Program Manager, on seeking out opportunities to work in niche Olympic sports, the growing uses of performance technology, and the value of building a strong support staff. Find Bret on Instagram: @bk_strengthcoach and on Twitter: @bret_kelly_ | Find Eric on Instagram: @ericmcmahoncscs or Twitter: @ericmcmahoncscs

Lyndie Kelley, Coordinator of Strength and Conditioning at the University of New England (UNE), talks to the former NSCA Head Strength and Conditioning Coach, Scott Caulfield, about her journey from athlete to strength coach at UNE. Topics under discussion include coaching and mentoring a variety of athletes and students, finding creative solutions for things and being resourceful at the Division III level, and having a fully integrated team from the athletic staff all the way to the non-athletic administration. Find Lyndie on Instagram: @noreaster_strength | Find Scott on Instagram: @coachcaulfield