Do not underestimate the value of waterborne exercise. This will be low impact and take load off of joints (though you are probably feeling the relief already with the amount of weight you've lost). This will allow you to concentrate on muscle workout, yielding more complete body toning. When floating, you'll also be able to add some resistance training. The aerobic exercise will release fat stores in your muscles (which are glycogen), and you should not be surprised of two results. One, the glycogen will be available to the blood stream so you'll probably notice a mild rush which may in turn cause release of seretonin to balance it. Feeling of well being, calm, good sleep, and being more energetic will result. Two, it might actually initiate a plateau in weight loss, and the body will change shape more drastically during this period where there may be no weight loss at all. But, you'll be happy with the shaping results. Use as many muscle groups as possible, but not heavily. The light exercise opens the storehouse of glycogen in each area. Suggest a moderate reduction of carbs during the 8 hours following the exercise. This would be inadvisable on low fat high carb diets, but LCers that have fully established ketosis are immune.