He is talks non-stop (not on drugs, legal or illegal), loves folding all the towels, walks around speaking with members unnaturally and non-stop like he's on Adderall, is below average intelligence but lectures people on everything (see:talking out of a$*), and has trouble focusing on tasks.
He enjoys coffee which calms him down
Long story short, it just hit me yesterday that this is a strong possibility. I'm introverted, intellectual, and accomplished in fitness. I believe he is intimidated by me being there as he talks behind my back and other employees. He even threw me under the bus twice. The last instance he had to lie to do so and was wrong for not calling me (sitch: had to cancel with client, she came and worked out by herself. He saw her and called corporate saying I no-showed at work. He said he spoke to her and she didn't know where I was. I have the texts as evidence to prove his maliciousness/deception)
Essentially, I'm the best player on his team. Now, do I chalk this up to impulsiveness as part of his ADHD or other hyperactive disorder or a mix of being jelly/anxious plus the former?
I told corporate I'd sit him down yesterday. He cancelled the meeting 10 mins before and my commute is 40 mins one way.....

So, today...how should I go about this?