Is it normal to wake up in the morning with a pulse of only 52 or 3 times per minute?

On the basis of normal heart, the lower the heartbeat, the better. Only measuring resting heart rate is accurate. Resting heart rate measurement method: wake up in the morning, don't get up, and measure your pulse every minute in bed. This is the resting heart rate. Because the heart rate at this time is the lowest in a day. Because I swim and run every day, my resting heart rate is 48/ min, which is generally below 70/ min. Your heart rate is too high, which is caused by lack of exercise. You need more exercise to raise and lower your heart rate.