The importance of recovery.
As you engage in physical activity, training, or working out, your muscles become strained and/or broken down becoming gradually weaker. It's during the post-exercise recovery period when the body heals itself. Strength and conditioning gains are made during this critical time.
If you don't completely recover before your next training session or competition, you won't gain the full benefits of your last workout.
Additionally, your muscles will not be ready to perform at the expected level to get maximum results.