Can I meet with a swimmer one-on-one or run a private lesson?

Yes, but only under MAAPP conditions:

One-on-one interactions with a minor athlete must be observable and interruptible by another adult. The exceptions are an emergency, a dual relationship, or the close-in-age exception (you're no more than four years older and have no authority over the athlete).

Meetings:

• Another adult should be present, and the meeting must be easy to observe.
• If it's one-on-one, leave the door unlocked and open. Use a room with windows if one is available, and keep the blinds open.
• Never meet in a hotel room or other overnight lodging during travel.

Individual training sessions outside regular practice:

• They must be observable and interruptible (same exceptions).
• You need advance written consent from a parent, at least once a year, with a copy to the club.
• Parents must be allowed to watch.