G. Gregory Haff

Your velocity device is telling you your athlete got stronger. It’s probably wrong. Here’s what the data actually say about velocity-based 1RM estimation 🧵 open.substack.com/pub/ggregoryha…

@NSCA @Doc_Haff The 5th edition is now available to pre-order on the NSCA's website: nsca.com/certification/…

Man and Machine: A Hybrid Approach to Athlete Load Management globalperformanceinsights.com/post/man-and-m…

Periodisation Isn't Programming. It Isn't a Calendar. It's a Deliberate Practice Framework open.substack.com/pub/ggregoryha… #strengthtraining #training #periodisation #deliberatepractice #NSCA #ASCA #UKSCA

Microdosing Your Strength Training open.substack.com/pub/ggregoryha…

I just wrote my first note on Substack substack.com/profile/271161…

I just started a Substack! You can subscribe to it here ggregoryhaff.substack.com/?r=g56y4&utm_c…

🚨 Barbell acceleration ≠ technique quality 🚨 📌 Take-home: barbell kinematics are informative — but not enough on their own to judge technique. 📖 Open-access paper 🔗 tinyurl.com/5n9aahm5 #Weightlifting #StrengthAndConditioning #SportsScience

Great deal for First Responders and their Families! @OSUTacFAN

In 2026, getting value from AI may be less about how many tools you use and more about the quality of the questions you ask.

🔥 NEW S&C DATA! 80% of professionals use Cluster Sets How they'r programmed: Power: LOW Reps (≤5) + LONG Rest Hypertrophy: HIGH Reps (9–12) + SHORT Rest Read the study! tinyurl.com/yf2dwvfk #ClusterSets #StrengthTraining #SCA #PowerDevelopment

@AdamVirgile @AdamVirgile just ordered a copy. Looking forward to reading this one

The Sport Science Handbook is available now! 👉 sportsciencenetwork.com/handbook What is The Sport Science Handbook? It is a practical, no-fluff guide that helps coaches, athletes, and practitioners turn data into action and make better decisions. It gives you the frameworks, mental models, and real-world principles that actually work on the ground in any environment, with any budget. We are incredibly grateful to everyone who shaped this project, whether through writing, expertise, feedback, or thoughtful review. A huge thank you to: • Matt Jordan (@JordanStrength) • Sam Contorno (@sam_contorno) • Emma Beanland (@EmmaBeanland1) • Harjiv Singh (@singh_harjiv) • Dave Tenney (@DaveTenney) • Anna Cruse (@AnnaCruse) • Johann Windt (@JohannWindt) • Dominic Samangy (@DSamangy) • Daniel Yu (@daniel_yuuu) • Jenny Strickler • Patrick Ward (@OSPpatrick) • John Wagle • Ernie Rimer (@ErnieRimer) • Dave Taylor (@Bballphysio) • Josh Nelson (@DrCoachNelly) • Jo Clubb (@JoClubbSportSci) • Matt Rhea (@MattRheaPhD) • Joe Eisenmann (@Joe_Eisenmann) • Jeremy Sibold (@JeremySibold) • Ola Eriksrud (@OlaAthletic1080) We also want to acknowledge the entire community of coaches, athletes, sport scientists, practitioners, and mentors who have influenced our thinking over the past decade. Every conversation, debate, question, and perspective has shaped how we understand sport, problem solving, and decision making. This handbook is one small part of what we are building at Sport Science Network, and we are just getting started. Follow @sportscinetwork for updates.

AI and prompt engineering share similarities with the research process. It starts with asking a clear question, testing, and refining based on what you learn.

Just published in @SportsMedicineJ. We explore how bringing the principles of periodization in exercise medicine can transform it into a precisely targeted therapy, by tailoring mode, volume, and intensity based on cancer type, stages, and treatments @ProfRobNewton @Doc_Haff

#titlestory 📌 Title: Performance in Multi-Joint Force-Plate Assessments in Male and Female CrossFit® Athletes 👨‍🏫 Authored by @jjowseytraining, @Doc_Haff, @PaulComfort1975 (Our EBM) and Nicholas Joel Ripley 👉 🔓Free at mdpi.com/2673-7078/5/2/… 🏫@SalfordUni @EdithCowanUni

🚨 New 📽️ AI, Sports Science, and the Future of Coaching: A Conversation with Professor Greg Haff 🔗 youtube.com/watch?v=vDKReU… How will AI and prompt engineering shape the future of sports science and strength & conditioning?

I had the pleasure of leading an awesome team of experts in writing the @nsca position statement on the use of weightlifting to enhance sports performance and it’s now available open access: nsca.com/globalassets/a…

➡️ Work as a #coach or #sports scientist in #football teams around the world? Please consider completing the below PhD project #survey ⏬

🚨 Coaches & Sport Scientists in Football! We’re studying how teams assess lower body asymmetries ⚽ 📍 State/collegiate level & above 🕒 20–30 mins, anonymous 🎯 Male & female teams worldwide tinyurl.com/3e4r4na3 #FootballScience #SportsScience #Soccer #InjuryPrevention

Do you remember when you joined X? I do! #MyXAnniversary