Ability to set min work sets to one (1) on some exercises.

Currently when completing Cardio exercises like Elliptical I want to initiate a 35-40 min work set, however each time I start my exercise I end up with two sets and have to delete one before I begin.  I would like the ability to set the work set to 1 so that I do not need to amend the exercise each time I start, currently up to 4 times a week.