Will i lose weight/tone up doing 30DS if i am already slim?

charlotteporter167

I decided to start the 30DS yesterday! I already go to the gym, and have done for about 5 months. I weigh just under 9st, and i'm 5ft5. I would like to look more toned, and perhaps a little slimmer. Will this be helpful or is it more helpful if you have more to lose/tone up?