Fitness motivation and willpower fail. No matter how many times you gain momentum and try a new workout plan, a new diet, a new way of battering your self esteem by looking at pictures of “fit chicks” for fitness motivation on Instagram, you never seem to be able to force yourself to stick to your goals long term. Naturally, we beat ourselves up. Girl, stop blaming yourself! Science has proven what we already kinda knew deep inside – motivation and willpower are bullshit. At least in the way we tend to approach them. Let’s dig a little deeper.   The Limitations…