im the same way,im considered morbidly obese and i have a terrible knee at 29....and the thot of goin to a gym filled with skinny ppl gives me panic attacks! ive walked but dang its been so hot out so i bought a richard simmons dvd sweating to the oldies (i know pretty cheesy)lol but its big ppl doing what they can and i love it and its not so hard on my knee.