When is the best time to work out?

Generally AM is best: First of all, exercise at anytime is great. If given the option, i recommend morning exercise for a number of reasons: 1) it is done and you can't put it off, 2) you get the benefit of the adrenaline (a stimulant) during the day, and 3) you will likely sleep better that night by not having adrenaline peak during the night.

Morning: Since sleep requires a person at rest it is best not to exercise 3-4 hours prior to bedtime.

When you can: To my knowledge, there is no better time for working out. The important thing is to do it, sometime. The hardest thing is to work it into your schedule on a regular basis, 30 minutes a day or more, so whatever works for you is best - there are many health benefits such as reducing risk for heart disease, arthritis, obesity, diabetes, and probably cancer. Thank you for asking.