I have just started a 6-session series of 30 minute sessions of underwater treadmill exercise supervised one-on-one with a sports physiologist. As I am beginning an exercise and fitness program with RA, a blown-out right knee and several neck and spine problems this has been highly recommended to me as a good way to start out while slowly adding other strength and cardio exercises. My first session was Tuesday, July 2nd and my 2nd session is Saturday, July 6th. How should I record this activity? 30 minutes of water aerobics (seems a bit low) or 30 minutes of water jogging (seems a bit high)? Please help and thanks! Happy July 4th!