Janeane, my boyfriend has a similar problem - there are many exercises he just cannot do safely. Have you checked the muscle directory here for some other options? I can suggest that for the calf raises, try bending your knee (if this is an option) you just need to bend it 30 degrees or so and that will isolate the calf muscle - you'll feel the exercise a lot more this way.

Lunges can be a PITA (pain in the ....) specially if you have bad knees - better to be safe than sorry later. Are you OK with squats? Modifying the program so that it works for you is OK, Janeane. Take a look at the interviews in the back - one of the transformations is about a woman in a wheelchair.

Nat