Other causes of cat sneezing include allergies, irritants such as dust or smoke, a foreign object such as a seed lodged in the nasal passage, nasal polyps, nasal cancer, or fungal infection. The inhalation of mold, pollen, and dust is one of the most common causes of intermittent cat sneezing.
Just doing something is better than no exercise at all. Remember, 20 minutes is considered the minimum prescribed amount of exercise for one day. As your body adjusts to this level of exercise, you should increase the amount of exercise that you are doing to continue receiving the maximum benefits.
The guidelines suggest anywhere from 20 to 60 minutes of cardio to be healthy, lose weight and get fit, depending on the types of workouts you do. That's fine, but you don't want to start with an hour of exercise. That's just too much for anyone if you haven't exercised for awhile...or ever.