A lack of persistence is a lack of one or more of these key ingredients. Think of persistence as a 4 link chain. You must have all 4 to develop persistence.
Napoleon Hill wrote that persistence is made of 4 ingredients:
1. Purpose: What do you want to have happen? Not "Ooh that'd be kinda nice," NO specifically what do you want? (Most people stop at purpose)
2. Plan: Engineer a plan. I reverse engineer my sales goals (results/ close % = at bats / working days = per day), but I forward engineer my weight loss. (Bust a sweat every day. Eat clean foods only) The point is to keep it simple and engineer it in the way that works for you.
3. Focus: Don't fall asleep at life's wheel. Pay attention to the numbers. Keep in mind that the numbers will NEVER WORK AGAINST YOU. It's the emotions that you associate to your numbers that is working against you. Numbers are just being numbers. It doesn't take emotions to add 2+2. A 1 is a 1...a 3 is a 3. A 5 doesn't try to be a 3, it's just being a 5. Now that you have a purpose, and working a plan, maintain your focus and treat numbers as numbers. Period.
4. Alliance: Keep "NO" people in your life. The kind of people who call you out on your laziness and slack. Don't make "don't want" people part of your alliance. Ally yourself with people who are higher, more powerful than you-who will call you out when you pull up.
The reason why you don't have persistence is because you haven't defined persistence and if you haven't defined persistence, then you can't be definite in persistence.