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.

Strength, flexibility, and endurance fare better during the hours of 2pm-6pm when your body temperature is at its highest. Reaction times are also quicker during this window making it ideal for HIIT workouts. Afternoon or evening workouts may also help you to stay motivated, especially if you're not a morning person.