From the London Times:

The Pope’s sessions in the gym will pay off on Good Friday, when he will carry a large wooden cross around the Colosseum. Leo, 70, will carry it throughout all 14 Stations of the Cross at the ancient Roman arena, symbolizing Jesus’s last hours before his crucifixion. This Easter, the pontiff is expected to not only flex his muscles but also his political clout. On Easter Sunday, when the American Pope will deliver the traditional Urbi et Orbi address at St Peter’s Square, he is likely to give full vent to his opposition to the Iran war.
His remarks could exacerbate tensions with the White House on the most important day in the Catholic calendar, and antagonize conservative American Catholics.