How do you burn more fat and less muscle?

You need to add in strength training. It'll help build up your muscles so you burn more fat in the off hours. It will also fortify your body including your knee.

Try strength training to build muscle. A lot of excersizes can be done sitting in a chair using the little hand held weights. Google to find some you might can tolerate. Good luck with your efforts.

Strength train, don't do obscene amounts of cardio, eat enough protein for your body (1g/lb of LBM should be sufficient) and don't dip your calories too low.

Well from the trainers I see at my gym, they always recommend some form of weight training to help you build and maintain muscles. It is possible to use weights to tone and not bulk up. I know a few woman friends who were afraid to lift weights as they didnt want to bulk up. But the trainers always tried to show them how it was good for them and wouldnt turn them into body builders. Cardio is also great. Have you tried the Eliptical machine? Does that bother your knee? I have had major knee surgery 10 years ago or so. So my goal was to get some weight off and try slow down the arthritis process and so far my knee is holding up. But it will depend on how ur knees hold up. hope any of this helps and good luck..

Hello critiry3
The single best way to lose fat is to do some kind of resistance exercise, either body weight exercises or weight lifting of some kind. Body weight exercise to start with Body squats, push-ups, lunges, pull ups(or inverted rows if you cant do that at first) all will help you start creating lean muscle. Scientific evidence that if you follow a strength building routine will help you create about .2% muscle every time you work out in that fashion. does not sound like alot, but if you were to work out every other day, 3 times a week, over the course of 12 weeks, you could theoretically add up to 5% lean muscle, replacing the fat in the process. Remember, lean muscle mass is 18% less mass on your body that the same amount of fat, so even if you replaced 10# of fat with 10# of muscle, you will still have shrunk in your dimensions,plus, every # of lean muscle you have on your body burns 30 more calories a day, so a 10# switch would mean an average of 300 more calories a day burned, or the equivalent of 2# of fat a month just for getting leaner. The cardio exercises should be done on off days, limiting it in my opinion to no more than 30 minutes. Also, if you do your resistance properly, and don't rest more than 60 seconds between sets of exercises, it will be a more caloric burn that any cardio workout. Try performing Total body workouts 3 days a week, resting a day in between each, doing a light cardio on the in between days like a 30 minute walk or light jog. I think Womens Health magazine online, they have some workout routines listed on the site that can help you get started on your journey. Also, try riding a bike around the neighborhood for the cardio days, I found it helped when I started, was not the pounding on my knees.
Hope this helped