(Python) If-Else Condition to Create New Column

I have a dataset on gym activity. I have data that looks like the following:

VisitNum   Date       Trainer   CaloriesBurned
1          01/04/20   Mike      500
2          01/06/20   Cindy     600
3          01/07/20   Lucy      550
4          01/10/20   Mike      650
5          01/15/20   Lucy      625
6          01/16/20   Lucy      575
7          01/19/20   Mike      525
8          01/21/20   Rebecca   592
9          01/26/20   Lucy      603
10         01/29/20   Mike      559

My goal is to have boxplots comparing the calories burned by trainer. This is just a snapshot of the data and there are >30 different trainers. I don't want to include all trainers in the plot, so I want to create a new variable, "Trainer2" that looks at the number of visits per trainer and if that number is less than 3, then the new value of Trainer would be "Other".

This is my attempt so far:

if data["Trainer"].value_counts() >= 3:
    data["Trainer2"]==data.Trainer
else: 
    data["Trainer2"]=="Other"

I'm getting an error when I run this code and I'm not sure what I'm doing wrong. Can someone help point me in the right direction?

Thank you!