yeah, you want to force yourself to do some activities that keep your metabolism up along with the restrictions
you can't exercise out of a bad diet but exercise is a helpful supplement to a good diet too. it's just that making yourself do it when you're tired and hungry is draining.
>you can't exercise out of a bad diet
You can, but it's not easy. People who exercise _a lot_ often have trouble eating enough calories. 5,000 to 10,000 calories a day is hard to eat and not out of reach.
I knew a guy who was drinking a gallon of whole milk a day for a while to try to maintain weight.
One of the traps is mental health. People focus on their body when dieting, but there are far more aspects to manage, and forcing themselves to do things they utterly hate will have wider impacts.
At the end of the day they'll blame will power or motivation or whatever else on why the diet failed, but still won't account for these same factors when trying the next diet involving basically the same mechanics.