Using JEFIT you are able to set up supersets.
Supersets combine two or more exercises with either the similar motions, same muscle groups or just connecting exercises together without any rest time in between each workout.
With the app, you will want to click on the "Workout" tab on the top navigation of the page and then select the exercise day you are looking to perform or set up supersets on.
After selecting the exercise day you will be taken to a list of all of the exercises within your planned exercise list.
From there you will want to click on the three dots icon to the right of the exercise that you are looking to superset together.
By clicking on the superset button, you will be able to link various exercises together into a superset, tri-set or quad set. You are able to link as many exercises as you would like together to create the superset of your choice.