Forgetting to Rehydrate and 5 More Terrible Mistakes You're Making After a Workout

Whether your workout is in the morning or at night, you need to get enough zzz's for your body to function and your muscles to repair and grow.

"Your body goes into recovery mode when you sleep, sending the nutrients and minerals your muscles, tissues, and bones need to repair themselves," Pedraza said. "Not only do you feel tired and sluggish, but your body hurts!" she said. Without it, your cortisol levels will be spiked, stressing your body out. Sleep helps quell cortisol to relax the body, so she recommends seven to eight hours nightly for decreased soreness and alertness come morning.