Sleeping is actually not easy. I reserve 9 hours in bed, but I snore and wake up very tired, also insomnia and therefore it’s a feedback loop to open the phone in bed otherwise I ruminate (potentially suicidal) thoughts… I bet less than half the population is able to sleep properly while laying in bed (and yes, I’ve heard all the advice about sleep habits and seeing someone).
Once you fix sleep, you become much more brave and courageous for sports. And it’s a positive feedback loop, it’s a blind spot for sporty people (I’ve practiced 8-9hrs a week) to tell “Just do sports and sleep soundly”.