Although almost any exercise is good for fighting depression and fatigue, yoga is especially helpful for boosting one's energy. According to a British study, six weeks of once-a-week yoga classes led to improvements in clear-mindedness, energy, and confidence among the participants, and yoga can definitely be considered a good "medication" for chronic fatigue. Besides, there are so many types of yoga and you can certainly find the type that suits you. And, it's never late to start.
Inspirational or motivational videos can make us forget our tiredness and give us new energy.
There are many such videos on youtube, for example check out this one:
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