Gymnastics or ice skating; both need precise balance to be able to work out.<span />
A will be the answer because usually marking your exercise days will become a habit because lets say you would do a running exercise but you want to do it in a certain day well if you mark it on the calendar, it'll become a habit.
I think that a condition which is related to your lifestyle, environment, and or hereditary that can increase the chance of someone developing a heart and blood vessel disease would be Alzheimer's and Dementia.
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