If it is not suitable, it is best to reduce the weight of each group instead of reducing the number of groups. It is also possible to add weight when muscle endurance and strength come up. Also, don't practice your chest and back for a day just because two big muscle groups can't bear it. Three heads behind the chest and two heads behind the chest belong to the intensive training of three heads and two heads. Because the previous chest and back exercises used three heads and two heads, it is suggested to reduce the weight connection of three heads and two heads. The next day was specially prepared for Santou and Ertou.