Discipline is choosing between what you want now and what you want most
If your WHY is strong enough, you will find the how.
You have to want to reach your goal bad enough; you must visualize how it will change your life, relationship with your body, confidence, relationships, and passions ( career, job or what you love most).
Doing this will make it much easier to say not right now for something better in your future.
If it doesn’t align with where you want to go, just practice saying NO, knowing you’ll get to your goal faster.