Yes. Many believe that weight is an indicator of optimal health, however, weight is not an indicator of health. Obtaining optimal fitness is more important than obtaining optimal weight. Often, these two move in unison; as you become fitter, you are at an optimal weight, as you gain weight you are likely less fit. However, you can be fit and be classified as overweight, and you can have the appearance of being an appropriate weight and be unfit.
Fitness is described as having a good health or physical condition secondary to exercise or nutrition. Optimal weight, however, does not mean you are in good health or in good physical condition; in fact, it is quite possible to be in poor health and poor physical condition even at an optimal weight. The best bet is to maintain a healthy diet and participate in regular physical activity. If you do, you will become physically fit and potentially obtain optimal weight.