Der innere Schweinehund: very dangerous animal, Germans are often fighting with.

Piggydog or Doggypig? Anyway according to this very funny colourful German expression you have to fight it if you want to achieve anything. Why? Here is the explanation:

Den/seinen inneren Schweinehund überwinden - 
- to overcome, conquer one's weaker self
- to avoid procrastination
- to fight inner couch potato

Beispiel: Du musst deinen inneren Schweinehund überwinden und anfangen Sport zu treiben!
Example: You have to overcome your weaker self (to fight your inner couch potato) and begin to go in for sports!