Programs of 30 days or less greatly improves the chances of completion.
Keep motivation high by seeing your friends shared activity and letting them see yours.
Share training programs of your own and keep track of participation and completion stats.
Proper exercise techinique is something we push for and providing quick, consise and high quality how-to videos is important to us. Videos are also a huge help when you have no idea what to do for an exercise name you have never heard of :)