Recently, Mr Speaker Bercow has allowed PMQs to over-run its normal half hour, perhaps as a kind of injury time to compensate for the usual bouts of shouting and general disorder.
Irvine also avoided injury by not over-training, building up to the distance he was to run in increments (twenty minutes run then building up to two hours) and stretching after a run.
The personal-injury lawyers would have a field day with this twisting, icy run, which follows the roadway over the Albula Pass connecting central Switzerland with the Engadine Valley, home of the famous St.