These are the rules on Body Magic:
To achieve your bronze Body Magic award, you’ll need to record 45 minutes of activity each week (over at least 3 days) maintained for 4 weeks. Every activity that you enjoy for 5 minutes or more counts.
To achieve your silver Body Magic award, you’ll need to record 90 minutes of activity each week (over at least 3 days) maintained for 4 weeks. Every activity that you enjoy for 15 minutes or more counts.
To achieve your gold Body Magic award, you’ll need to record 150 minutes of activity each week (over at least 5 days) maintained for 8 weeks. Every activity that you enjoy for 15 minutes or more counts.
You can also go for a 'platinum' award which is 2 consecutive gold awards
I do SW online so have no idea how you get the stickers, but should imagine you fill out a log and give it to your consultant when you have completed each award
Good luck!