i weigh between 110-115 pounds and i'm female. i always swim 200 yards with the kickboard and the rest of the 1300 yards doing freestyle. i usually keep track by keeping a count in my head of each 100 yards. since i swim in a public gym, sometimes i have to take unwanted breaks between each lap because of people in front of me. i try to complete each 100 yards without stopping at the wall for longer than 1-3 seconds (can't do a flip turn). how many calories do you think i'm burning? is there an easier way to calculate this? thanks :]