StrechCordz w/Handles

I just bought these and have used them only twice separated by about a week because I was so sore after both workouts. Waiting for my third workout in a day or two. I am a 61 year old strong, competitive, long distance open water swimmer. I have been swimming since I was 5. These green bands are plenty strong for me. I bought the red ones too, but will probably never use them, as the green ones provide plenty of resistance. For proper elbow position, attach them above a doorway and bend your body at the waist so your hands are at head height or slightly above.