Working out and physical fitness requires significant rest in order to achieve your true fitness goals. It is not possible to work out vigorously, putting your body through multiple tests, and then sleep only six or seven hours a week without feeling lethargic and eventually risk injury. Making fitness and sleep part of the same workout process is important for maximum body change.
What does sleep do? Sleep allows your body to recover from heavy workouts. If you are doing weights and engaging in heavy cardio then you will need to rest your body significantly. Fitness gurus know the value of this sleep and try to put in enough hours of rest. Without it grow will be limited and your body will begin to feel tired and may actually reverse gains.
How much sleep is necessary? Somewhere between 8 and 10 hours a sleep is necessary for someone who is engaged deeply into the fitness lifestyle. Everyone should sleep at least 8 hours, even if they are not working out regularly, but fitness buffs need that extra 2 hours for full recovery. If you wake up tired and groggy then you need more sleep.
There are micro traumas that occur in your muscles that when they heal lead to muscle growth in size, endurance and strength. To help them heal people can take supplements, rest and sleep. In this case, sleep is the main criteria for growth and development. Focusing on different body parts each day and getting a good night sleep makes all the difference in achieving your fitness goals.