My body is certainly feeling the effects of 3 children in 4 years. Do you know what sort of exercise your body reacts to well? With mine, it's walking. If I walk 30 min - 60 min a day 3-5 days a week, the weight drops off me. And to tone up, I do laps in my pool, or sit ups (althought I don't like that very much lol). Just be gentle on yourself to begin with.