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It turns out that running may provide stronger bones than resistance training:

Osteoporosis affects more than 200 million people worldwide and is a serious public health concern, according to the National Osteoporosis Foundation. Resistance training often is recommended to increase and prevent loss of bone mineral density (BMD), although previous studies that examined the effects of resistance training in men produced varied results. Now, in a new study, University of Missouri researchers have found that high-impact activities, such as running, might have a greater positive effect on BMD than resistance training.

“The results of the study confirm that both resistance training and high-impact endurance activities increase bone mineral density. However, high-impact sports, like running, appear to have a greater beneficial effect,” said Pam Hinton, associate professor in the Department of Nutrition and Exercise Physiology in the MU College of Human Environmental Sciences.

According to the researchers, the true effects of weight-bearing or resistance exercise are only apparent when controlling for differences in body weight or composition. People who primarily perform non weight-bearing activities will benefit from resistance training that increases lean body mass, Hinton said. People who engage in activities, such as cycling, swimming, or rowing, should add bone-strengthening activities, such as resistance training or running, to their exercise regimens.

On another note, some feel that walking is better than sex. You be the jury.