The simple solution to this is to exercise with weights to keep your muscle tone. Now some people may find the idea of exercise just too much to bear, I originally found it impossible to get myself in the mood. What I discovered though, was by simply taking the first steps and starting off really slow, I managed to build myself up gradually. I am now at the stage where I feel so much better about myself, and I actually find myself looking forward to my little work outs.
So, my best advise then will be to start gradually and really enjoy yourself, only work at a pace you are comfortable with, you really do feel the benefit and as a bonus exercise really makes you feel good mentally. Take a look at this book for excellent tips - 101 Ways to Work Out with Weights: Effective Exercises to Sculpt Your Body and Burn Fat!
