Hi Proxy, it is possible to change the number of reps and sets for each exercise. On the app you can just grab the exercise in your list and slide it to the left. It should bring you to a pop up where you can change the values. In the website it's a bit more work to get to it. Check out the Jefit support center [url]http://support.jefit.com/hc/en-us[/url]

You'll find answers to just about all the questions you might have about the app and the website.