You would expect a person in good physical condition to have a lower resting pulse and to be able to rely significantly on blood pressure increase to deliver blood to the muscles during exercise, rather than mostly on increase in heart rate. Only one person, AH at the top, did not have an increase in blood pressure during exercise. This could have been an error in measurement, though, since just having the pressure in the cuff be allowed to fall too rapidly could have made it possible to miss the point where the tapping sounds started. Other than that, it seems like everyone's data showed significant use of blood pressure increase during exercise, and pulse increases which weren't excessive, which can be interpreted as showing that all these people are in good physical condition, whether they said they work out frequently or not. Time is shown on the line adjacent to the EKG tracing.
Small peaks mark the time for one second.
To measure the time for one beat, take the time from, say, the highest point in the P wave of one beat to the same point on the next beat. There is a lag between the P and the QRS waves because the signal to depolarize is delayed when it gets to the narrow fibers of the AV node. This is important because this delay allows time for the atria to contract before the ventricles start depolarizing and then contracting.