When you are swimming how fast does your heart beat?

when sprinting (putting in as much effort as possible) your heart rate will reach around 200bpm (beats per minute). Swimming at an average pace your heart rate will be around 150-160 bpm and at a slow easy leisurely pace your heart rate will be around 120-140 bpm. Heart rates will vary for different people and in general the younger you are, the higher your heart rate will be and the fitter you are, the lower your heart rate will be.