Short term, it probably does make things worse. There are studies about limited willpower, like when you measure the patience of people by having them performing a chore, the control group have more patience than the group that where explicitly forbidden to eat that cookie over there.

But doing it every morning is different. First, by making it a habit, you don't need as much willpower as you did the first times. And if it trains willpower, then the long term result will likely be better than doing nothing.

Similarly, when you exercise in the morning, it leaves you more tired for the rest of the day. Your muscles may even ache the following morning. But do it every (other) day, and it (i) won't be that tiring, and (ii) you'll be in better shape anyway.