"Work out even when tired, unmotivated, or just not feeling like it," said Linda J. "It's when you need to work out the most to boost mood and endorphins. Stick with it like with brushing teeth — consistency is the key."
Saskia V. suggested following the "five-minute" rule on days you don't feel motivated: "you only need to do 'x' for five minutes, then you can stop, or you only need to show up at 'x,' then you can leave again. Chances are you're going to keep going."