I don’t think you can be a glass half empty individual and be a body builder. Myself I always see I positive.. example: I just strained my pec minor, I cant do my fav workout for a month.. no biggie, I need some legs anyway. This is a successful outlook. I take training day by day, set realistic goals and attain them. I love every second of my training, every aspect of it. That’s how I stay motivated.