I teach two schools per day 3 kilometres apart, I become tired by walking to and from one school, what really makes me tired is walking very fast to keep time that I mostly fail to keep.
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@JonathanMBR Is it a stupid question to ask why you don't take a bicycle for those 3 km?
@cweickhmann no bicycle available, bicycle is very effective in the morning which is downward, I don't get late in the morning because I start journey very early, the problem is return which is uphill. Mountain bike is the one that is effective.