If you are not using the stairs as a cardio workout, consider this a part of your active daily living activities. Just know that SparkPeople, when they determine your calorie range, factors in an active daily multiplier for these activities so counting this as exercise could hyper-inflate your calories burn goal and slow your progress. That being said, the more active you are, the more calories you are burning even if you are tracking them in your My Fitness Tracker. GREAT JOB!!! And keep up the AWESOME job!