Runtastic has put out a fair number of apps to help you sleep, track excercise, and train various parts of your body. Now it's time for your legs to have their own time in the spotlight with Runtastic Leg Trainer.
Runtastic Leg Trainer provides a number of instructional workout videos that will help you to target specific areas of your legs that you'd like to work on, along with the option to set your own excercise and weight loss goals - and yes, the 3D avatar puppet people are still in there. So basically it's a lot like Six Pack or Butt Trainer, only it's for your legs.
You can download Runtastic Leg Trainer for free, right this very moment.