Momentum is effort earning assistance from its own history.

After a while, the work starts helping you. The notes you took, the decisions already made, the skills that no longer need thinking about, all of that history begins carrying part of the load, so the same output costs less than it did. That is the whole mechanism behind people who seem to accomplish an unreasonable amount.

Invest deliberately in things that will assist your later self, the written record, the reusable piece, the properly learned fundamental. It slows this week down. It is what makes the year after next feel disproportionately easy.