Winter Lifestyle Challenge Competitors! The fifth and last week of our challenge starts this Sunday, February 9 at 4:00 PM and ends at 4:00 PM on Sunday February 16! During this fifth week you can weigh in and get your measurements done up through the end of the business day on Monday, February 17. But as to the Lifestyle points you must continue recording your progress on BTWB up through Saturday, February 15. We are almost done! Hang in there! Looking forward to seeing some awesome results!