Sex and the City's Kim Cattrall said a trendy new exercise "saved her life."

Cattrall said "Fizzy Yoga" got her through rehearsals for the upcoming Tennessee Williams play "Sweet Birth of Youth," the Daily Mail reported.

Fizzy Yoga is Cattrall's word for the mix of physical therapy and yoga, the Daily News reported.

"When I meet someone for the first time, I do a physical therapy evaluation," Diana Zotos, who introduced Cattrall to physiyoga, told the Daily News. "Then we customize a yoga program around that. It targets deficits, will strengthen muscles that are weak and stretch muscles that are tight, while focusing on the core."

"As I get older, I find that cardio is less important to me. What I want to do more of is intense stretching," Cattrall said, according to the Daily Mail.

'I'm not worried about injuring myself because a regular yoga instructor isn't versed in the way of the body like a trained physio is,' she said, the Daily Mail reported.

During the play's three month run, Cattrall suffered from a stiff lower back and sore knee. She said her instructor, Helen O'Neill, "saved her life" during the grueling play schedule.

When she was still Samantha Jones, Cattrall said she was more into high-intensity cardio workouts.

"I'd do massive sessions of heavy cardio before each series started and then no exercise at all during filming," she said. "I'd just collapse at the weekends."

Since her knee gave out two years ago, Cattrall has had trouble getting back into her old methods of exercise.

"Fizzy yoga' bridges the gap between yoga and physiotherapy. The Bucks-born 34-year-old was working as a physio for the Canadian National Snowboard Team when she noticed that people kept coming in with the same complaints - like knee pain," O'Neill said.

Cattrall has been asking O'Neill to move from London to New York.

"I think Helen's really got her finger on something that women my age can use to make our lives pain-free," Cattrall said.