But exercise yields more benefit than just cancer prevention. Don't you want to maintain strength and mobility as you age? Sleep better? Build mental and physical resilience?
I'll wager that we won't see a substitution for exercise and its benefits. Ever. It's just part of human life, and embracing it is by far the healthiest mindset.
Biology is complicated. If we start digging for mechanistic underpinnings, we'll uncover thousands of genes, variants, expression levels, metabolic pathways, epigenetic factors, etc etc etc. None of which will result in a cure-all pill or method to replace exercise and all its benefits. Just not gonna happen unfortunately
I'll wager that we won't see a substitution for exercise and its benefits. Ever. It's just part of human life, and embracing it is by far the healthiest mindset.