PHILADELPHIA (CBS) — Taking a brisk walk may be better than working out at the gym to keep weight off, according to a study.

Researchers in London found that people who walk regularly for more than 30 minutes have lower body mass index numbers–and smaller waists– than those who go to engage in regular exercise.

The effects were particularly noticeable for women, and both men and women over 50.

Researchers conclude “promote walking as a potentially effective way to tackle obesity rather than public health messages on healthy diets.”