That in turn helps prevent osteoporosis. A nice benefit, I would say. Another benefit to toning your muscles, is that it increases the number of calories you burn when you are not exercising. Simple fact - muscle tissue burns more calories than fat tissue. Fat is stored energy.
Muscles consume energy, or calories.
As you sit, you will burn more calories than you did before your muscles were tone. Yep, more weight loss. Actually, you may not notice the weight loss on your scale. I guarantee once you start toning your muscles you will notice a difference in how your clothing fits you. It really is important to have guidance when incorporating strength training into your exercise regimen.