I've started following a high intensity interval workout, and I'm getting bored with doing the same exercises plus some of the exercises in the workouts are hard on the knees. Since my knees were injured in a car accident, I avoid squats and lunges for that reason. I am able to do side lunges, running in place, and other exercises that are not extremely stressful on the knees. Any suggestions for other interval exercises that are safe for knees and don't use machines?
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