I am an older athlete, with a few niggling injuries. The laser relief has got me back to be able to train with intensity. My knee is giving me no pain anymore as the laser relief has taken the swelling from my quads and ITB and therefore there is no impact on my knee. I also use it for my tennis elbow as I am a personal trainer and do a lot of repetition weight lifting. I also use it after a hard swim session to take the tension from my upper back. Can't live without it!