Resting heartbeat of 61!

I bought a blood pressure monitor at Walmart. Its measures Systolic and Diastolic blood pressure with a cuff that wraps around the wrist. I checked my blood pressure before working out and it was 104 over 67, at 61 heartbeats per minute. After spinning for 40 minutes, and working up a good sweat, I checked it again. This time it was 113 over 78, at 105 beats per minute. I thought to myself this can't be right, so I checked it again and it was 103 over 75 with a heartbeat of 101! My heart rate was getting back to normal fast. I had a very bad cold and I did not ride for several weeks. I was afraid that I had lost my fitness. Having a resting heart rate of 61 is not bad for a 53 year old man!