As more and more studies show that short bursts of intense exercise are best for getting you into shape, you might wonder if there’s a limit to how hard you can work and still be healthy.

A new study from the Journal of the American College of Cardiology shows that joggers who run at a vigorous pace — though not at their peak effort — are likely to live longer than those who run at a really strenuous pace.

This doesn’t mean that not exercising at all is good, though: Of the study’s approximately 5,000 participants, the joggers (no matter how fast they ran) had better Body Mass Index, blood pressure and lower rates of diabetes than the sedentary non-joggers.

People who jogged at a decent pace for around 1 to 2.4 hours a week — spread out over three runs — had the best chance of living to old age, according to the study. The most intense runners — the ones who were working really hard for longer stretches — were as likely to die as those who didn’t run at all.

To read more about the study, which was done by researchers in Copenhagen, Denmark, click here.