I have very limited computer skills and would have no idea how to create an App but today I had an idea for a great/everyday App. I would like to see an App where the user could document their workout. Something to keep track of what exercises you are doing, how many sets/reps, at which weight. For cardio work outs (swimming/running/biking) you could keep track of distance/laps and how long you did each exercise. Maybe even calculate an estimate for calories burned based on the user's weight and length of workout.

Proper documentation of exercises is so important in order to maximize effectiveness.

What do you guys think, seems like a useful App?