I find myself with a bit of work out ADD quite often. I switch up my workouts for a lot of reasons, primarily to save boredom.
Unless you train at a Crossfit, PT/Rehab or Strength & conditioning type place. There’s a sad piece of of cardio equipment that doesn’t get a lot of love. Well let me tell you you are missing out! Try the ergometer also known as the row machine, but please do have a professional show you proper form.
Some benefits: low impact, total body, a calorie burner, and strength cardio rolled up into one!