UPDATE: Tracking broken I previously gave 3 stars, lowering to 2. Thought app was set in wrong time zone. Turns out it's just broken. Early in the day it picks up exercises checked off from day before. Later it drops my checks so it appears that I've never competed the advanced program, even though I have competed the program as scheduled the past 2 weeks. Giving 2 stars because I like the exercise reference so I don't have to go back to the book. I can't believe I paid for this.