When working out with weights you are using your muscles, even creating small tears in your muscles (this is why you’re so sore the day after lifting weights), but these small tears heal and make your muscles stronger. Lifting weights doesn’t mean that you have to bulk up. Instead, lift lighter weights and this will tone your muscles instead of making them grow extremely large. Whether you are just looking to tone or are looking to bulk up, only lift a weight that does not interfere with your form or technique execution. If you do, you could end up seriously hurting yourself.