The More You Do The More You Get Done

This works for me too. Working out in the morning (or whenever it is I decide to get up) _always_ gives me more energy for the day and it usually puts me in a good mood too.

I've heard many such articles stating that exercising increases energy levels. However, they never seem to specify exactly what type of exercise.<p>Are they always referring to cardio? I tried exercising in the morning a while back, but I was doing weights. I felt anything BUT energetic for the rest of the day ...

I exercise to get better sleep and not to get more stuff done. A half hour of jogging and I'm out cold.

...only if these tasks are varied. I don't think this works if you focus only on one area of your life.

That is probably due to the increase in testosterone level.