<human>: Throwaway account probably wasn't needed for this, there's nothing scandalous in this post.

I've been with my current company (marketing agency) for about two years now. I work pretty closely with the president of my company, as it's a pretty small organization. He's not flirtatious or anything with me, he's been happily married for over 30 years, has two kids, it's nothing like that causing my problem. But there is one thing he does that drives me absolutely crazy.

Oftentimes, we have meetings with clients at their place of business or at restaurants. Whenever we leave the office, he walks RIGHT behind me. To the point where he sometimes kicks my feet or steps on the backs of my shoes. The hallways are kind of narrow, and my boss (another female) usually walks next to me, and he's very gentlemanly about "ladies first." 

I know this is probably the dumbest post on r/relationships, but I'm afraid to confront him about it. I hate confrontation, and I don't want him to be embarrassed. Also, I feel like I've been putting up with it for so long that it would be awkward to bring it up now. He literally only does it when we're leaving our office building for a meeting or coming back, never around the office. I really want to say something next time it happens, but I don't know how to go about it without embarrassing him or making him feel like he did something wrong. I'm sure he doesn't even realize he's doing it. What would be the best way to go about this?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: the president of my company walks too closely behind me and steps on my shoes/kicks me on accident. Driving me crazy. How do I confront him?