re: I quit doing cardio

LINK

quote:

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Low SMI was significantly associated with the increased risk of all-cause mortality

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muscle mass predictor of longevity in older population

quote:

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Other studies have shown that low SMI is significantly associated with an increased risk of all-cause mortality in studies with a follow-up time of 5 to 10 years (1.28, 95% CI, 1.15–1.44, P<0.001) and more than 10 years (1.25, 95% CI, 1.11–1.42, P<0.001).

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here is one showing strength is even more important than muscle mass
LINK



this is all covered in "The Barbell Prescription" too.

and its not just longevity but also quality of life.