People often complain that they lack strength, desires disappear somewhere, and fatigue sets in long before bedtime. Does modern man really have less energy than people of previous generations? It turns out not. But we make many mistakes in using our energy resource and therefore it seems to us that our strength is running out already in the first half of the day, and enthusiasm, excitement, joy of life are ephemeral and short-term phenomena. Let's try to regain what we accidentally lost. First, let's find out where we lose energy. And then we’ll see from what sources we can draw it. Life will become easier, life will become more fun. Life is energy that we can use for happiness.