Susan Sarandon has taken up boxing

The 'Calling' star told PEOPLE.com: "Someone gave me lessons as a gift, then I continued, and I like it. I like the gym. It's really fun with all the boxers, and it's fun to hit - it's a workout!"

Susan also revealed the secrets to her youthful appearance.

She said: "If you want to age gracefully, you don't smoke cigarettes and probably laugh a lot, and get the normal amount of exercise, and eat well and stay out of the sun would be the main things.

"As is having an amazing makeup and hair team, that's really the secret."

She added: "It helps to live in New York because I walk everywhere. I ride my bike down the West Side Highway, and I get 30 minutes on the treadmill."

Susan hopes to be a "fun" grandmother.

She said: "I do some crafty things, but I have not yet learned to knit. But I'll do whatever she needs me to do.

"Mostly I see myself as a memory-maker for my kids and my grandkids. It's just for me to take them places and do things with them - [Eva] can hold down the fort, and I'll do all the fun stuff."