Your body is used to having "crutches" in the form of artificial stimulants, so you have to retrain it to rely on what nature intended. Having an exercise routine, even a relatively simple one, will stimulate your body to produce endorphines, dopamines, seratonin, in short, all of the things that elevate your mood and give your energy a lift WITHOUT the negative side effects of artificial stimulants, such as nicotine and caffeine.
Side-note: I love coffee, but it doesn't love me back. When I drink it regularly (like more than once a week), I don't notice much, if any, lift in mood and I get really irritable and my threshold for handling stressors is severely reduced and I have to work at focusing on single-tasking. In short, there's no free lunch, artificial stimulants have a greater downside than upside.
So, a regular exercise routine will elevate your mood and energy, and thereby help with motivation.
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