Learning that an injury doesn't have to mean no exercising

I am having a hard time lately. Both with eating well, and working out.
I have not been able to work out, do to my hip and knee trouble! Uggh Somehow, I need to work around my injury. Some things that has worked for me in the past and I thought I would share them with you. The pool is a great way to work out in spite of an injury. Walking in the water is a great start. It can be a great source of cardio, as well as a great way to do some physical therapy. We begin by making the movements slow and steady.
Leg lifts in sets of 4. ~
Front~ side~ back ~side~each set bringing your leg slightly higher. In addition, flutter kicks holding on to the side of the pool, in sets of 30 seconds.
If you have pain in the lower part of your body, you may need to work on upper body for awhile. You can do push~ups in the pool, (hands on the side of the pool and your body out behind ) also, if there is a ladder or a diving board, you can do pull~ups, using that. Try sets of 30x4reps.
Remember we are Gradually increasing our activity. No need to start with running a marathon. You must first train. That is where we are, in training. Yes I like that. We are in training.