If you’ve ever tried to change your habits, no matter how far along you are, or how many times you’ve tried and failed, morale is your biggest challenge. Our bodies are fantastically elastic and will respond to any changes we make. It’s our minds that will always give up before our bodies (given that you’ve no major health problems). If you lose sight of how much progress you made and feel bad about it, remember that each small change has an impact. If you think that 5 or 10 pounds isn’t much, try and walk around with a sack of flour or a free weight for a day. That’s what your legs used to carry; that’s what your knee used to bear. When you throw down the extra weight at the end of your experiment, remember that’s how much lighter you are now.