A "toned" body is in good shape: muscular but not too muscular. A professional dancer or swimmer probably has a "toned" body.
Use "get" to describe becoming toned. Use "be" to describe someone continuing to be toned:
I'm pretty toned right now, but I'd like to work on sculpting my abs a little more.
("Abs" are stomach muscles, and "sculpting" muscles means exercising until you can see each muscle clearly.)