Newton’s First Law of Motion states than an object at rest tends to stay at rest, and an object in motion tends to stay in motion unless acted upon by an outside force.
When you are sitting on your butt doing nothing, you will find that it is very easy to continue to do so, and the longer you stay that way, the more effort it takes to change out of that mental state and get your butt into motion. It’s like people who decide to take a break after high school or college before continuing their education. Of course it’s important to take breaks, but if the break is too long, it becomes too difficult to get going again. 1 year off becomes 2 years. 2 years rolls into 3 until one day they’ve forgotten their original intentions.