First off, only add caffeine to your routine if your health allows it. I began drinking 2 cups of Joe on the mornings I perform cardio exercise. I usually drink green tea but caffeine increases your metabolism allowing the body to burn more calories during and after exercise. This study expands on that and shows afternoon exercise actually conferred MORE benefits than morning workouts. That said, I cannot tolerate caffeine in the afternoon as it interrupts my sleep. And sleep is paramount for recovery, physical and mental.
I did notice I burn more calories, thanks to my handy Fitbit, when I added coffee on those days. It's something to consider doing if you can.
Here is Link to Study:
