It's interesting what getting back into the gym does to you.

If you've never been to the gym before, it's a completely different dynamic than going BACK to the gym after spending some time there in the past. The first time you ever go to a gym, you're nervous and anxious because you don't really know what to expect. Will the exercises be hard? Will people laugh at you? Will you look like a dork when you overestimate / underestimate the weights for your machine? Will people laugh at you? Will it hurt tomorrow? Will people laugh at you? So on and so forth. It's quite daunting.

However, going BACK to the gym, you already know the answers to those questions (shortcut for cheaters: the answer is "yes" to all of them) - and that makes it 10x harder to get your ass back in that building and do what you know you're supposed to be doing.

But once you're back into the swing of things, it's really a great feeling.

Ok, actually, it's not. You become immediately aware of all the junk you've been shoveling into your gullet the past few weeks / months / years, you feel guilty for not getting back in there sooner, you feel even MORE guilty for ever leaving in the first place, and you feel ridiculous as you move the pin on the weight stack from the high numbers you remember lifting to a much lower number so that your arms and legs don't fall off and run away in protest.

But after all that, it's great.