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American Fitness Index Rankings
American Fitness Index

2025 Rankings

The ACSM American Fitness Index ranks the 100 biggest cities in the United States for their healthy, active lifestyles. Cities with higher scores are seen as having strong community fitness.
Rankings Archive

The 2025 Fitness Index ranked Arlington, VA as the fittest city in America for the eighth year in a row! All 100 cities are commended for their achievements and encouraged to use the Fitness Index findings to track and focus their efforts to achieve a healthier and more physically active population. Explore the 2025 Summary Report for the full rankings, new insights on the Fitness Index indicators, and inspiration from cities working to make changes. To directly compare a specific city, or cities, to the top-ranked city on each indicator, use the new city comparison tool below. The tool may be easier to use on devices with larger screens.

Interested in the science behind the ACSM American Fitness Index? Learn about our methods published in the Translational Journal of the ACSM. 

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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