How many calories are burned swimming an hour of breakstroke?
The answer to this question depends on how much you weigh and
how hard you stroke ;-). The more you weigh, the more mass you have
to pull through the water and the more calories you burn/min.
Obviously the harder you work, the more calories you burn. There
are lots of places on the web where you can get the answer to this
question.
For example 1 150 pound person swimming breaststroke for 60
minutes, burns 714 calories.