In 2017, I worked with 7card on this campaign. The title was 'Come and Play' and the whole idea was built around the trigger that you need to go to the gym - if you see it as a fun thing it will make you go and work out.
I thought about a boy and a girl that have a special feature - each extremity has a different sport-related item. One foot has special football shoes, one hand has a dumbbell and so on.
These represent the joy and enthusiasm (so many things you can do!) - you have to try every sport and see the fun part in them.