Humans need to experience both struggle and relaxation. If you spend all your day relaxing, you become bored, restless, and desperate to do something. By contrast, if you spend all your time exerting mental and physical energy.
If you want more energy, then you should inject some movement into your lifestyle. Exercise is one of the best ways to give your energy levels a much-needed boost. Even a 20-minute job can be enough to make you feel more alert.