Running with a quick tempo or going slower because you are tired?
The answer is going slower. Your hamstrings act as springs and the less time you’re on the ground the more effective your running stride is.
That is bio mechanics in motion. You can still apply that to your day and tasks to get done. Know what you want to get done and the best path to get there. Be effective, be quick and don’t slow down. It will only come back to make your job that much harder.
Make it the best day!