You decide to practice

You decide to practice a bit before going to bed. After pondering for a moment, you decide to do some push-ups.

You get in position and promptly begin the exercise, this is when you realize how out of shape you are. You try your best to keep going and at least finish 10 push-ups, but fail to push yourself back up on the last one, falling face first on the ground.

You get up and try to brush it off, but it clearly hurt your ego and made you finally realize how big the difference is between you and your sister.