A:AnswerYes. You accept challenges through the app on Your phone. Your Fitbit syncs to your phone and you keep track of your challenges on app. It’s a lot of fun! Enjoy
A:AnswerNot the Inspire series I have but they do make devices that measure all of the other stuff. The series I have measures everything but your heart rate and bp.
A:AnswerI haven’t gone more than 3 days without a charge and even then it’s usual still at 70% charge. I thought the relatively short battery life might be a problem (much shorter than my old Fitbit 1, but I usually charge it while I’m in the shower so haven’t had any issues with the battery life.