When I would struggle to find the motivation to get up and run with my training buddy at 6am for the 6th day in a row, my mate would always text me with 4 simple words...
"What would Rocky do?"
He always knew exactly what button to press! haha!
That and when I was struggling in a padwork or circuit class he would start singing Lionel Richies "All Night Long" or "Easy Like Sunday Morning!" lol.