Your goal must also be attainable and realistic. You wouldn’t set your goal to lose 30 pounds in the next 5 days, because it’s just not realistic. Setting a goal to lose 30 pounds over the next 10-12 weeks is a real and attainable goal.
When I think of this definition of failure, I’m reminded of Thomas Edison, the inventor of the light bulb. While there are many conflicting stories of how many times Edison “failed” at inventing the electric light bulb, most agree it was in the thousands before he found the right combination of materials.