Resistance Training Is An Important Part Of Any Exercise Routine.
The best options for toning your muscles involve some resistance training, which should be a major part of your exercise to get in shape for summer. While you do not need to do a lot of weight lifting unless you actually want to bulk up a little, some resistance training is necessary. This includes getting free weights or a home gym in order to work out your upper and lower bodies. You should also use resistance training on your abdominal muscles - this way they will look much better than if you are just relying on un-weighted sit-ups or crunches to help you build your stomach muscles.
The other benefit of doing resistance training, especially on your abdomen, is that it will likely help you feel better during the rest of the day. Strong abs, for instance, will improve your posture. This, in turn, can also reduce the amount of aches and pains, especially in your back, that you have to deal with now and in the future.
Finally, exercising to get in shape is always a good idea! Even if you do not reach your goal for the summer, you will still have done your body good.