I am a full time teacher and am on my feet 5-6 hours a day. I perform aerobic activity 2-3 times a week. I have experienced both complete lost of urine and leakage while exercising. I recently, experienced a small amount of leakage while walking. Before exercising I empty my bladder, which may or may not be a large amount of urine. What type of incontinent do I have and what should I do?