According to science, it's early in the morning before breakfast.
"There is some evidence that working out on a completely empty stomach — or, as scientists call this woozy, wee-hours condition, "in a fasted state” — prompts the body to burn more fat and potentially stave off weight gain, compared to exercising at other times.
In a groundbreaking 2010 study, researchers in Belgium persuaded young, healthy men to stuff themselves for six weeks with a diet consisting of 30 percent more calories and 50 percent more fat than the men had been eating. Some of the volunteers remained sedentary while gorging. Others began a strenuous, midmorning exercise routine after they had had breakfast. The third group followed the same workout regimen, but before they had eaten anything.
At the end of the six weeks, the sedentary group predictably was supersized and unhealthy, having gained about six pounds each. They had also developed insulin resistance and larded their muscles with new fat cells. The men who exercised after breakfast had also packed on pounds, about three pounds each, and developed insulin problems. But the men who had exercised first thing in the morning, before eating anything, had gained almost no weight and retained healthy insulin levels. Their bodies were also burning more fat throughout the day than were the other men."
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My name is Sam Yang. I'm a martial artist, entrepreneur, fitness nerd, information geek, and productivity nut. For more useful information, join my newsletter. You can also connect to All Out Effort on Facebook and Twitter. For more philosophical posts, check out Must Triumph