Gaining

Is there a legit program one can get to enroll in to reprogram yourself?

Hypnosis can be a tricky one as you would have to be tested to see what works on you. Its not magic either so it has to be something you absolutely want and if there is any hesitation than it might not work. It also depends on how your mind works such as analytical or non analytical. I say give it a go and do some research on who is recommended in your area.

Has anyone tried the "subliminal messages" on some YouTube videos for weight gain?

Bah! LOL! Sounded fun, though!!

The placebo effect does exist and proves that you can will things to happen.

I'm gunna hafta think that over while I have a snack.

I don’t think they’re any more effective in increasing weight gain than any other kind of encouragement, at least not for me, but they’re fun to listen to. Some people are apparently more susceptible to hypnosis and might actually see results beyond just enjoying a sexy video, but I think for most people it’s just a pleasurable experience in the moment.