"Strength or force gained by motion or by a series of events." - Merriam-Webster
The goal of starting is sometimes to gain momentum.
Momentum propels you.
Starting and stopping disrupts momentum. You have to expend more energy to start over just to regain it.
But energy is finite, so each start and stop diminishes it.
Once the momentum kicks in, the best thing is to be consistent.
Take whatever action is needed to keep it going.
On a related note, my last post was my 21st in a row. They say it takes 21 days to form a habit. I'm not quite sure it is yet, but I'm going to keep going. Here's number 22.