During photosynthesis, light energy is used to produce ATP molecules which are then used to construct sugar molecules from carbon dioxide and hydrogen obtained from water. Chloroplasts have two outer membranes and several stacks of small disc-shaped membranes called thylakoids (also spelled thylacoids) inside.
Scheduling a week off will give your body time to do this and will also help you return to your workout stronger and ready to challenge your body once again. Many endurance athletes end their season with a week off and many weightlifters will take a week off from their program every four to eight weeks.
The American College of Sports Medicine, or ACSM, suggests beginners lift weights up to three times per week with at least one full day of rest between workouts. This general recommendation is adequate for the average weightlifter who does a 30 to 45 minute full-body weightlifting workout three times per week.