Cameron Diaz credits “lots of sex” as her fountain of youth in a recent interview with Vogue.

Her shopping habits, however, suggest that exercise is possibly just as responsible for the 37-year-old’s ageless appearance. This shot was taken as she left a NYC Lululemon store yesterday.

Unless Lululemon is her Victoria Secret (it’s virtually ours here at Well+Good) and she plans on modeling what’s inside the bag for A-Rod…