- Why people can suddenly become frail in their 70s: https://amp-theguardian-com.cdn.ampproject.org/c/s/amp.theguardian.com/science/2022/jun/01/research-may-reveal-why-people-can-suddenly-become-frail-in-their-70s
- Surgery or no surgery: https://www.jospt.org/doi/10.2519/jospt.2022.11075
- The best measure of fitness: https://worldcrunch.com/culture-society/vo2max-health-life-expectancy
