I spend a lot of time making my workout calendars. This feature would allow the user to select their own exercises and also use the workouts suggested by M&F. It would make this site more flexible and interactive. For example, if a user could not do a certain exercise M&F lists on the set workout, he/she could substitute in the exercise he/she is able to do in place of the M&F suggested exercise. A drag and drop or a click the box type interaction between M&F’s lists of exercises by body part would be great!