AI Answers to Fitness Questions Cite nih.gov 41.5% of the Time, the Top Share of Any Industry

The National Institutes of Health's nih.gov appears in 41.5% of ChatGPT and Gemini answers to fitness questions that cite a source, the strongest lead any single website holds in 12 industries. Government and university websites take 45.5% of fitness citations; forums and social media take 0.2%.

All answers by rank

41.5%

34.1%

12.3%

10.1%

5.7%

5.5%

5.1%

3.4%

2.6%

2.3%

2.1%

1.9%

1.7%

Source: Suff Digital analysis of 1,600 AI answers to 400 fitness questions · ChatGPT and Gemini, September 2026

ChatGPT

Answers with no source

1.4%

Share of sourced answers citing it

47.4%

Source: Suff Digital analysis of 1,600 AI answers to 400 fitness questions · ChatGPT and Gemini, September 2026

Share of sourced answers by industry

Legal

14.7%

Health

32.3%

Money

13.8%

Real estate

27.2%

Home improvement

11.8%

Travel

13.2%

Cars

6.7%

Software

24.3%

College

13.1%

Fitness

41.5%

Pets

18.4%

Recipes

37.5%

Source: Suff Digital analysis of 1,600 AI answers to 400 fitness questions · ChatGPT and Gemini, September 2026

Source: AI Answers to Fitness Questions Cite nih.gov 41.5% of the Time, the Top Share of Any Industry - Suff Digital