Yes, you can change/edit or add the exercise in personalize form here is the procedure. 

  • Step1: If you are an Android user click on the Floating option button and go to Exercises, If you are an IOS user you can click on Exercises            in bottom tab 
  • Step2: To change the recorded exercise form you can click on rerecord and perform the exercise.
  • Step3: To add the custom exercise click on + button on top right corner and select the muscle and add the name of the exercise. 
  • Step4: You can delete the custom added exercise by long pressing on it. You can not entirely delete pre-existing exercise, you can just clear                the recorded data.