People who do a lot of heavy lifting may seem healthy and fit, but two studies featured on TIME report that they may actually be at risk for heart disease.

The first study, conducted by researchers from Harokopio University in Greece, involved 250 first-time stroke patients, 250 first-time heart event patients, and 500 healthy patients who were asked to rank their jobs according to how physically demanding they were. Those who had more manually taxing jobs were more likely to have heart-related risks.

The second study, conducted by researchers from the University of Ghent in Belgium, focused on 14,000 middle-aged men who were asked about their jobs and their exercise routine. Those who had less physically demanding work, but exercised in their spare time, showed a 60 percent decline in heart disease risk. On the other hand, those who had more physical work, and exercised at the same time, had a 70 percent increased risk of heart disease.

Despite the apparent muscle toning manual labor provides, the stress that accompanies it on a daily basis may do more harm than good. If you have a labor-intensive job, give your body time to rest and recuperate.

(Screencap from Charlie's Angels: Full Throttle courtesy of Columbia Pictures)