What is the recommend heart beat ?

Heart rate: The normal heart rate at rest is 60-100 bpm. It goes faster with exertion, anxiety, stress, and medications or foods, like caffeine. It goes slower with rest and is usually the slowest during sleep. Athletic conditioning can also naturally lower your resting heart rate, sometimes down into the 40's and 50 bpm's. See your doctor if you're concerned your heart rate is too fast or slow.