Habit List ($3) for iPhone doesn't force you to adopt your new habits. It gently encourages. Get motivated to cook a homemade meal, work out, or meditate by trying to beat your own "streaks."
This app keeps track of how many times in a row you can complete your goal. Your habit list will show red badges when you've slacked. Gray ones are more ambitious, optional goals that don't affect your streak. There's also flexible scheduling: set habits for every other day, four days a week, every two or three days, or any other variation.