When I was training for a triathlon many years ago, my friend who was also training would text me and we would agree to meet at the gym for a morning swim a few times a month. At 5:30AM, of course! Every time the alarm went off, I cursed and cursed and made it out the door to drive to the gym, just in time. Neither of us never missed a swim date, and it was because we would never be able to live it down if either of us failed to fulfill the commitment.

It is one thing to go to the gym at 5:30AM. It is quite a different thing if your friend is expecting you to be there and they also got up early.