This is a Medscape article about a study on fitness and weight loss.
The first couple of paragraphs:
"Big news from an electrophysiology meeting usually involves technology.
The European Heart Rhythm Association (EHRA) EUROPACE-CARDIOSTIM 2015 meeting bucked that trend. It turns out that the device required to help millions of people afflicted with atrial fibrillation is a pair of sneakers—for exercise.
The intervention that led to marked improvements in AF burden, lower blood pressure, better glycemic control, lower LDL-C and hs-CRP levels, and favorable structural changes in the heart: cardiovascular fitness."