den inneren Schweinehund überwinden
to overcome one's weaker self; to beat one's inner couch potato
Origin
"Schweinehund" comes from hunting jargon (boar-hounds chased wild boar) and became an insult in the 19th c.; the "inner Schweinehund" - one's own laziness - has been used as an image since the post-war era.
Building blocks
Words in this expression
Examples
Morgens den inneren Schweinehund zu fällt am schwersten.
Beating my inner couch potato in the morning is the hardest thing for me.