I find that setting some fitness goals always helps me when I get in a rut. Right now, it's run 13.1 miles by October - the month of my first half marathon. Lifting-wise, it's breaking 300 lbs in the deadlift by December. If I didn't have these personal goals, I'd probably never go to gym regardless of knowing how good it is for me and knowing that I should go.
1) eat real food - more vegetables, moderate meat, moderate fruits, less grains, less sugar, less vegetable oils.
2) exercise - moderate intensity cardio, sprinting, heavy lifting, dedicated stretching and mobility.
3) live - relax, de-stress, meditate.
Disclaimer: I'm not professionally qualified to make any formal recommendations. I've just done my homework and I'm my own guinea pig. All of my data, unless otherwise cited, comes from a sample size of n=1 (me).