I HAD A KNEE REPLACEMENT THREE YEARS AGO AND THE GAZELLE WAS THE ONLY THING I COULD USE TO MAKE ME STRONG. I AM 65 YEARS OLD AND I TRY TO EXERCISE AT LEAST THREE TIMES A WEEK. I FEEL LIKE A MILLION WHEN I USE THE GAZELLE. BECAUSE OF YOUR MACHINE I WALK BETTER AND I FEEL 100% BETTER THAN I HAVE IN 20 YEARS. WATCHING THE VIDEO IS ALSO ONE OF MY HIGH LIGHTS BECAUSE WITHOUT IT - IT JUST IS NOT THE SAME. YOU ARE AN INSPIRATION.