Why is exercise important - it helps you build muscle
Before you run a mile, I'm not talking about looking like a 1980's body builder.
I'm talking about having defined arms, a flat stomach and a pert bum. That 'toned' look you really want.
All of that takes muscle. And building muscle takes exercise.
Here comes the sciencey bit.
When you exercise you should be overloading your body. This causes tiny little tears in your muscles.
These tears trigger your body to go into repair mode. And when it does your muscles are made slightly stronger and slightly bigger so you can cope with the overload in the future.
It's this building of muscle that is crucial if you're after a firm, lean looking body.
Relying on nutrition alone for weight loss won't trigger your body to go into repair mode, which means you won't be building muscle.
So essentially you may be the weight you want to be, but you won't have the look you're after.