I drove between cities today and watched my friend's 1-year-old. Walked at a park and only did 4k steps there, and had to come home late and finish. No matter what the excuse is. (and we do have some valid ones sometimes. Try to finish when it is within your means. Every small decision matters. Go for it. It is rewarding; it hurts, but it is a pain that is good for you, a pain that refines you.