The fall and rise of Farah and Viren

In this article - Mo Farah and Lasse Viren are of course proud owners of the "double-double". Lasse achieving his 5000m and 10,000m successes back in Munich (1972) and Montreal (1976) and Mo unforgettably triumphing over the same distances in London (2012) and Rio i(2016).  As world-beating athletes both shared resting heart rates of a little over 30 beats per minute; both would own mightily impressive V02max figures, and both would have regularly run well over 100 miles per week. So what else do their share in common?