Harley Pasternak's 6 Star-Tested Tips for Looking Your Best at Any Age

The celeb trainer and PEOPLE.com blogger reveals how Sandra Bullock, Halle Berry and more stay forever gorgeous

4. Don't Over-Exercise

Who gets it right: Sharon Stone, 54
One of the most common mistakes I see people making is over-exercising. Working out too hard or too much will lead to a sidelining injury. The key is – as it is with almost everything – moderation. Stay active all day instead of trying to get your physical activity in for the day in an hour at the gym. Sharon Stone looks as incredible as ever and only works out as much as she has to, staying active throughout her day by doing things like parking far from the entrance, etc.