Research from Appalachian State University explored how the timing of strength workouts impacted sleep quality, according to MSN.

Aerobic exercise, on the other hand, decreases resting heart rate, so doing it first thing in the a.m. is smart. (Try this cardio workout that’s better than the treadmill) In fact, according to research previously done by Collier and his team, “7 a.m. is the best time to engage in aerobic exercise since it clears stress hormones earlier in the day which lends to a better night’s sleep.”