Medicare Advantage plans that offer to pay for gym memberships attract healthier adults, which could potentially save the insurer money.

These government insurance programs offer coverage for more services than Medicare, like vision and dental. Premiums are adjusted based on preexisting medical conditions, so sicker applicants pay more.

The study by researchers at Brown University found patients on Medicare Advantage plans that had gym memberships were healthier; they had fewer activity limitations and could walk better.

Experts say this study proves gym memberships may be an attractive business proposition for insurance companies.

The researchers analyzed 22 Medicare Advantage plans to come to these results.