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ACSM American Fitness Index
Explore the economic cost of physical inactivity and discover how regular activity reduces healthcare expenses and boosts productivity. Infographic developed
Explore the importance of community partnerships in promoting active lifestyles through collaboration among organizations and agencies.
Explore the economic cost of physical inactivity and discover how regular activity reduces healthcare expenses and boosts productivity. Infographic developed
Physical inactivity drives up healthcare costs and lowers productivity, costing the U.S. billions annually. Investing in physical activity infrastructure not

American Fitness Index ranks 100 largest cities based on 35 indicators  Despite a significant increase in Americans’ aerobic and strength

View the top 10 cities and learn about the new indicators from the 2025 American Fitness Index rankings.
The 2025 ACSM American Fitness Index has added new indicators: trail miles, splashpads, and pickleball and dual-use courts.
Policy can encourage physical activity across all levels. Three keys areas for policy application are public spaces, transportation and school-based
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You can't out-run a sedentary lifestyle. New research shows that light-intensity physical activity is an important part of your routine

GSSI Pre-Conference

The Physiology of Hydration: More Than Water Alone

This session explores the physiology of hydration through an integrated lens—examining how carbohydrate, sodium, flavor, and fluid interact to influence intake, absorption, retention, and performance. We’ll review current research on fluid balance, osmotic drivers, and palatability, highlighting mechanisms that underpin voluntary intake and thermoregulation. Attendees will gain insight into individualized strategies, including sweat profiling and timing approaches, to optimize euhydration and mitigate performance decrements associated with >2% body-mass loss. Practical applications will be linked to laboratory- and field-based research, ensuring translation from bench to field. This pre-conference equips you with evidence-based tools to support athlete hydration across diverse environments and sporting contexts. 

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  • Session 1: Sweating the detail: New insights on hydration considerations for athlete performance
    • Lewis James, PhD, Associate Professor in Human Nutrition in the School of Sport, Exercise and Health Sciences at Loughborough University
  • Session 2: Functional ingredients in fluid replacement beverages for athletes
    • Lindsay Baker, PhD, Director at the Gatorade Sports Science Institute
  • Session 3: The hydration toolkit: Practical approaches to athlete support
    • Floris Wardenaar, PhD, Associate Professor at the College of Health Solutions at Arizona State University