Our expert says:
Don't force it, but also understand that if you don't have some level of discipline, you'll feel tired most days! I think if you have low iron, and know this, you have to start by treating that problem, and then also work gradaully towards getting more exercise in the afternoons. If you're training smartly, you might be tired, but you'll feel better after training. It helps to energize you, so to some extent, "forcing" it does help.
However, if there is a problem like iron, or a very stressful job, then it's OK not force it, but rather to work towards building up the fitness levels. You might for example start at 10min per day, and see how it goes, then increase it until you hit 30.
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