write down all of the reasons why it would be good to continue going to the gym and all the reasons why it would be bad if you stopped going to the gym now.

Write as many as you can, even the small things.

For example, you might say 'if I quit now I won't see what I am capable of, If I quit now I will fall back into bad habits, etc etc.'

and 'if I keep going then I will achieve my goals, I will look better, feel more confident etc etc.

Be pedantic and just make as big of a list as you can and then read over that list. It should get you motivated again to go.

The other thing is that you might not always feel an inward energy driving you to go the gym...thats completely normal...sometimes you have to just push yourself into doing what you don't want to in order to get results.

Also, sometimes we need rest. Listen to your body. If you have been working out really hard then its fine to take a small amount of time off but just don't let it get too long.