You're right about posture and preserving muscle. I've been thinking about that quite a bit also. These days, I love Classical Stretch. Again, I haven't done Callanetics in a while, due to too many workout choices and too little time. I've never tried T-Tapp because it hasn't appealed to me at all. Callanetics was very do-able and is effective. At least it was for me. I believe that any workout you choose to do can be effective, but only as long as you do it regularly and consistently. Your plan is a good one and you should see results regardless. Yes, losing weight is hard as we get older. I struggle greatly also. It is mostly about diet and I can't do that these days. I have almost all of the Callanetics videos. Love them all. Wish I had time to do them far more regularly.