Some research shows the best time to run is between 4 and 5 PM [
1]. This is because at night, the body experiences its peak core temperature, which translates to an increase in energy metabolism, flexibility, range of motion, speed, agility, and endurance [
2]. And no need to worry about insomnia; research has shown that running approximately four hours before bedtime can improve sleep quality [
3,
4].
Don’t fret if that timeframe doesn’t work for you - adaptations to training are greater at the time of day at which training is regularly performed [
1].