Those three things are not hard to do or unenjoyable.
You feel better for doing all those things and want to keep doing them as a result usually. I love to lift heavy weights and sleep. Eating healthy not so much but life isn't all about having what you want all the time.
I do differ with the no caffeine past noon though. I don't have too much trouble with caffeine and falling asleep though.
Apart from sleeping well, fitness & diet are tough at first but once you get in the flow they're easy and actually become a part of what you love to do. Just got to find the right workout for you.
Because it's counter intuitive. Living healthfully seems boring but feels exciting. Just like partying all the time sounds exciting but is actually super boring.
1. Exercising well (45-60 min of strenuous exercise, 4-6 days per week, walks for sun exposure)
2. Eating well (limited junk food, no alcohol, no eating outside of a fixed time window, home cooked, mostly veggies)
3. Sleeping well (8 hours, consistent timing, early to bed, no caffeine after noon)