Those are not my estimates. Here are a couple sources:
ATLANTA, July 11, 2024 — A new study led by researchers at the American Cancer Society (ACS) finds four in 10 cancer cases and about one-half of all cancer deaths in adults 30 years old and...
pressroom.cancer.org
"A new study led by researchers at the American Cancer Society (ACS) finds four in 10 cancer cases and about one-half of all cancer deaths in adults 30 years old and older in the United States (or 713,340 cancer cases and 262,120 cancer deaths in 2019) could be attributed to modifiable risk factors, including cigarette smoking, excess body weight, alcohol consumption, physical inactivity, diet, and infections. Cigarette smoking was by far the leading risk factor, contributing to nearly 20% of all cancer cases and 30% of all cancer deaths."
And here's an older one: Katzke, V. A., Kaaks, R., & Kühn, T. (2015). Lifestyle and cancer risk.
The Cancer Journal,
21(2), 104-110.
Also, I inferred nutrition in the "and more" part of my comment.
It's completely logical to conclude that by encouraging more physical activity (e.g., Apple Watch), that will improve the quality of life for people and possibly cut down on cancer risk in individuals.
The link between higher physical activity and lower cancer risk has long been demonstrated:
Robert Thomas, Stacey A Kenfield, Yuuki Yanagisawa, Robert U Newton, Why exercise has a crucial role in cancer prevention, risk reduction and improved outcomes,
British Medical Bulletin, Volume 139, Issue 1, September 2021, Pages 100–119,
https://doi.org/10.1093/bmb/ldab019
So yes, people who have a gym membership and go regularly, on average will have lower risk of cancer. I wrote in my other comment: "if people are maintaining lower weight and higher physical activity
because of Apple products or software running on Apple products [they should have lower cancer rates, on average than people who do not maintain lower weight and higher physical activity]".
"Even healthy people who exercise regularly get cancer."
Of course. What's true on average for a group is not necessarily true for an individual. Also, everyone dies, but we can make choices that help us live longer and healthier. We will not ultimately prevent death, however.