Ooof. I hate to disagree with Manda, cause I really respect her ... but ...
There's no such thing as toning a muscle.
When you do squats or crunches or bicep curls or whatever .. you're building or strengthening or working THAT muscle. If you're doing it right, you're not just working the primary muscle or muscle group, you're also working a bunch of secondary muscles and muscle groups.
So when Manda says you can't spot reduce - she's 100% right.

Doing 500 crunches will not remove belly fat. Doing 500 squats will not remove butt fat. Doing 500 bicep curls will not remove arm fat.
Doing all those things *will* build beautiful, strong muscles - in your core, your butt, your thighs, your back, your shoulders, your arms. That means that when you lose all the weight you want to lose, all those gorgeous, strong, defined BUILT muscles will show through your skin and you'll get that fit look that most people define (incorrectly) as "toned".
.