Can You Work out Too Much?

Maybe. But don't turn on the TV and settle onto your couch just yet.

Can years of strenuous exercise actually harm your heart? Possibly, if you take your workout regimen to the extreme. That’s one possible conclusion from a recent British medical study of extreme endurance athletes. Lifelong endurance runners, frequent marathon participants and alike showed early signs of scaring of heart muscle, which eventually can lead to irregular heart function and possible heart failure. Then again, to paraphrase Wallis Simpson, the Duchess of Winsor, overtraining is a bit like being too rich or too thin—good problems to have.