A common response to identifying lifestyle changes that might make a depressed person feel better is, "Easier said than done." Someone coping with depression may get what she's supposed to do, but the question is how? After all, depression kills motivation, energy, interest, and focus.
Motivation is a powerful, yet tricky beast. Sometimes it is really easy to get motivated, and you find yourself wrapped up in a whirlwind of excitement. Other times, it is nearly impossible to figure out how to motivate yourself and you're trapped in a death spiral of procrastination.
You've probably noticed that it's hard to be motivated all the time. No matter what you are working on, there are bound to be days when you don't feel like showing up. There will be workouts that you don't feel like starting. There will be reports that you don't feel like writing.