The differences between motivation and discipline
If there is something you want to achieve, your internal reasoning that forces you on a path towards achieving this goal is motivation. How much effort you put in, in order to achieve that goal, is discipline.
Motivation is just one part of becoming an exerciser and it's probably the one thing we struggle with most when we're just getting started. Rather than letting that motivation fade away, think about what it is you really want for yourself beyond weight loss and looking good.
People who exercise look for reasons to do it because they know it makes life better. Think about what would make your life better and you'll find the motivation to keep moving.
Discipline to achieve the goal you set.
7 steps to iron self-discipline to achieve your fitness goals