Well, it really depends on your heart and how well your heart can recover, how elastic the heart is, or how rigid it is. When you exercise, you stress your body.
Normally, you should bounce back fast, but a lots of people, as they get older, the arteries become rigid, the heart becomes inelastic, and they just don't recover. So the pulse rate takes a long time to come down. So, a lot of times, if a person's doing high-intensity workouts, they'll go to bed and they just will not sleep that well.
So, for those people, they need to do more walking, where it's low stress, lots of oxygen. Because the high-intensity workouts, high stress, low oxygen, you activate the adrenals, and it just messes up your sleep. So, the one thing you might want to try is exercising in the morning if you're doing high intensity.
Now, if you were an athlete before, you were a professional athlete, or you did a lot of workouts maybe in high school or college, and then you hadn't worked out, your mitochondria, the little energy factories, are so developed that they generate a lot of energy. So, if you don't exercise or don't get that energy out, that can disrupt your sleep. And that's my case.
So, I have to work out every single day, or I'm laying there with tons and tons of energy. So, I personally do a high-intensity interval training workout in the evening, but I really emphasize recovery to make sure it's long enough so I don't overtrain. So, the answer to this question is, it depends on how well your heart recovers, okay? If it's not recovering, you stick with the walking in the evening, and maybe do the high-interval training in the morning, alright?
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