You may know that muscle weighs more than fat and that the body uses more calories to support muscle than it does fat, so increasing your muscle tone means that you need more calories to sustain you, and you will look and feel much beter. Life become easier when you are strong - carrying shopping, running up stairs are easier; loking at yourself in a mirror may become a whole lot easier too!
Here's a great article on strength training for weight management.
Read it and do it :-)