If you itemize your deductions on Form 1040, Schedule A (PDF), Itemized Deductions, you may still be able to deduct your personal portion of mortgage interest, property taxes, and casualty losses on that schedule. There's a special rule if you use a dwelling unit as a residence and rent it for fewer than 15 days.
According to Harvard Medical School, you will burn about 240 to 356 calories per hour doing water aerobics, which is lower than the 420- to 622-calorie expenditure from participating in one hour of step aerobics at a low intensity.
A typical example. Exercise (1) is the slower 60/40 mix and exercise (2) is the faster, 30/70 mix of fat and glucose fuel. Walking on a treadmill for 30 minutes -- 180 calories used -- 108 calories of fat burned. Running on a treadmill for 30 minutes -- 400 calories used -- 120 calories of fat burned.