Why? The impact of getting something sticky done on your day, and your week can be incredibly empowering and motivating.
The caveat is that has to be something that will add value to your business. It has to lead to a sale, better embed you with a customer, improve a process or make a saving. Do it first and do it well. Avoid distractions like meetings and email and tick one important task of your list. Remember do work that matters.
So, is it the invoicing, the difficult sales calls or that proposal that need your attention this morning?