Best times to attend the gym: 10am: After the typical working day has started. 2pm-4pm: After lunch breaks have ended and before the work day finishes. 8pm: After the crowds attending straight from work have finished their workouts for the day.

Studies have shown that working out at 7 a.m., compared to later in the afternoon or evening, may help individuals get more quality sleep at night. One more argument making the case for a workout first thing in the morning is that exercising on an empty stomach could burn more fat.

Research on exercise timing and performance is mixed. However, ongoing studies suggest that afternoon or evening exercise may improve athletic performance. One study examined how time of day affects high-intensity exercise performance. The results indicate that performance peaks between 4PM and 8PM.

When you've been up and moving all day, your body may be better prepared to handle a sweat or strength-training session, physicians say. Plus, you have more fuel in your system from meals and snacks throughout the day to fuel your energy level and keep you going.