Have you ever wondered why, when you talk about trying to do something, it feels physically tiring? It's because the muscles and communication in your body have just switched off, you probably crashed your computer.
We do this all the time. Trying is a good example because your body and your natural intelligence doesn't understand the concept of trying. It can only do or not do. So when we talk about trying we are, literally, confusing our body/mind communication by giving an order the body cannot compute.
At the physical level we are very literal. Subtleties of understanding positive and negative for instance don't exist. If someone tells you not to think of a pink elephant you immediately think of a pink elephant because the 'not' doesn't exist to our natural intelligence - only the image of the pink elephant.
We can support our energy by the language we use both to ourselves and others. You only have to feel the difference when you tell yourself, 'let's do it' rather than 'let's try and do it.'
Test it our on yourself.