I have really made exercise a part of what I do and who I am. I typically exercise six days a week and I do something different every day. (These days I do step mill, adaptive motion trainer; spin class, Pilate’s reformer, yoga, running, boot camp and weight training). The variety has really worked to keep me motivated and I have not gotten burned out. It's also amazing to see what your body can do when you push it, and how it will improve over time. So, for me, it's variety and consistency, and also consistently pushing yourself on what you can do - increasing weights, resistance, speed, etc.