"Si no estás avanzando, estás retrocediendo."

Simplified Meaning:

When you stop trying to improve or make progress in your life, you end up falling behind. Think about riding a bike: if you don't keep pedaling, you can't just stay in place. You'll eventually start to wobble and fall off. This idea can be applied to many areas of life, like learning new skills at work, keeping your body healthy, or maintaining good relationships with friends and family. For example, if you stop learning new things at your job, you may get stuck doing the same tasks while others move ahead. To avoid this, keep pushing yourself to grow by taking small steps regularly, whether it's reading a new book, exercising, or learning to cook a new dish. Constantly looking for ways to improve helps you stay ahead and prevents you from getting left behind.