Hugo commented on a message in the group Feedback
Hi! The challenges only support activities / performance tracking from today's date. But you could start a challenge from now until the end of the year. At 1st of January 2014 you could do it for the whole year. ;)
i've noticed it guesses your bmi and doesn't allow you input your body measurements. There should be an app that permits the individual to input these so they can get the right information in regards to their weight loss and body tone.