Postcard front and back

I am trying to create a 2 sided postcard to advertise my fitness business. I teach a variety of group fitness classes so I need a postcard that will promote these specific classes (Boxercise, Zumba and ViPR). I need a catchy phrase on the front of the card with some images (i was considering using images of the logo's for each of the 3 classes).
On the back I need my contact details to be included.