Accountabuddy
The person who's mere existence encourages or guilts you into doing what you should be doing for yourself, anyway. Your accountability buddy.
Aaron: Man, I so wanted to sleep in today, but I knew Doug was going to be waiting for me at the gym. Couldn't let him down.
Brenda: Getting in shape is always so much easier when you have an accountabuddy!
Brenda: Getting in shape is always so much easier when you have an accountabuddy!