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.
However, a short and to the point answer is that a boy should not start lifting weights before he hits puberty, usually around 12 to 13 years of age. The main reason for this is simply due to a developmental difference in boys who have hit puberty and those boys that have not. An adult can set a rigorous schedule of lifting 5 to 6 times per week. 2  However, a boy should not keep that kind of schedule. 3  It is often recommended that a boy workout 2 to perhaps 3 times a week at maximum. 4  This will ensure that there are no issues with overworking muscle, which can result in serious injuries.