AKA "My worlds collide:"
It turns out that Carlos Sastre (of bike riding fame) and Fernando Alonso (of F1 auto racing fame) met at a football match some time ago, realized they are fans of each others' sports, and as such, Fernando recently spent a day riding with Sastre's TestTeam cycling squad. Meanwhile, Fernando is (or has, probably, since that link is a few weeks old) letting Sastre into the pits during a practice day at Renault's test track.
Sastre apparently commented that he was surprised at Fernando's fitness. Knowing what conditions are like during an F1 race, it shouldn't be surprising at all - intense heat, extreme g-forces, and other unrelenting factors certainly demand a lot from an F1 driver's body, fitness-wise.
What a neat experience for both of them.