I’m currently coming off some patella tendon pain and am looking for good cardio workouts that will rest my knees. I plan on doing stair climbing/hiking 2x a week and gradually increasing intensity as not to re stress my knee. I feel like my legs are strong, but my cardio feels lacking. I’d like some exercises that will rest my tendon but give me a good cardio workout. I’ve tried the elyptical but can’t seem to make it intense enough to get me really working hard. Any suggestions?