I haven't had a chance to go thru the rest of the posts here, but I'm sure that people described Pilates to you. It's not aerobic, but more isometric. You are on the floor a lot so you won't have to worry about your knees, etc.
You basically got three videos, one is a basic video which instructs you on what Pilates is and how you do it correctly to get the most benefit out of it. The second is a 20-minute "quickie" workout video. The third is a one-hour workout video. Do either depending on how much time you can devote to a workout. I do Pilates up to five days a week.
The meal plan is basically a throw-away (at least it was for me).
HTH! and good luck. Post back here after you do a coupla workouts. I'm curious as to how you'll like it.