Hi all -

I am starting the challenge tomorrow.  I have a very sedentary job and a left leg that needs strengthening.   I fired up the eliptical for a few minutes today to see if the display worked and my left knee felt so unstable it almost hyperextended.  

I have a torn ACL from three years ago that I decided was not bad enough to pay for surgery.  On St. Patrick's Day this year, I sprained my MCL pretty bad on the same knee.  

Does anybody have suggestions for exercises that can rehab my knee but also not cause a lot of strain and stability issues at first?

Are there any exercises I should avoid until my knee gets stronger?

Thanks for your help everyone.  Good luck!