I got lazy

Does your injury prevent you from doing *any* exercise at home? For example, using anything around the house for weight resistance? A bottle filled with coins, a milk jug filled with sand. Can you get into a pool and "jog" in place? How about riding bike? I'm trying to come up with ideas that may be low (or no) impact since I don't know your medical condition. Do you have a stability ball? A 20 pound loss by Christmas may be possible for some, as stated above, but I personally don't think that is an attainable goal -- it would not be for me. I typically lose 0.5-1.0 pounds a week and that is meeting 10,000 steps a day and logging food on MFP.