Need new activity

I am 34 year old femail that needs to step up my activity and exercise. I usually do 1hr water aerobics class twice a week. I have had 4 surgeries on my foot and ankle and was supposed to have had another so i don't do a lot of jumping around type things. I can walk just fine but it gets quite painful to run, jump, or walk for long periods of time (my toes just go numb). I wear a large orthodic with a bar running thru it to act like a bone that I do not have in my foot and it allows me to last longer on my feet. All that being said, I am trying to find something good and challenging that I can work around my issues with. I was thinking of starting Jillian Michaels 30 Day Shred. Just wanting to find something i can physically do or at least modify for myself, to get some good cardio in.