No discipline seems pleasant at the time, but painful. Later on, however, it produces a harvest of righteousness and peace for those who have been trained by it.
"Whatever doesn't kill you makes you stronger." No truer statement makes you push for more. The only difficult thing about setting new goals is the discipline you have to change about yourself to make it come to fruition. It only hurts for awhile, but at the end, you'll be able to look back and say, "I did it". Today, like Nike says, "Just Do It"