Person on rowing machine 1: It's sometimes hard to make yourself come, but you're always glad once you've done it!
Person on rowing machine 2: Wow, what a great gymuendo!
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!