What weights to use?

What weights should I use to tone up my stomach and the rest of my upper body and how do I use them?

I already do cardio 3 times a week what else can I do?!!!
 
Isn't toning removing fat so you could see the muscles? If so, the treadmill alone could do the trick... he says nothing about getting more muscle tissue. Take this as a question of mine..
 
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