Returning to the present day, Seiler says the 80/20 split should be used as a guideline rather than a strict rule, so he ‘can live with training 85/15 or 75/25’. But he stresses that you ...

Begin with short intervals of running followed by short intervals of walking, then slowly progress to longer intervals of ...

The "80/20 color palette rule" is a design guideline that suggests using one color scheme for 80% of a room, and a contrasting color scheme for the other 20% to create balance and harmony.