How is your heart beat? Do you check on it? Not medically but for real. i found out that my heart beat is regular and especially during two moments of the day/week it goes towards the extreme without even touching them. During sitting time of meditation it slows down a lot, during a dance performance it does increase.
Traditional Chinese doctors suggest not to take to any hyper dynamic activity after 50 years of age. When we get old we should keep our heart beat on the same regular tune as much as possible. Nowaday there is a big trend to go jogging, running ~ there are big financial companies here in town which promote marathons to push up the heart beat of their employees and throw them in stressful conditions with the pretest of charity events or enhancing team spirit. But a completely conscious person will not listen to them and have great care of his heart beat.