Why is it called shou3手and拳?

This game may Improve Thinking Power   
把手头衔一个词            为何榔头非榔手 why is it called as a head not hand? 
为何拳击不叫劈snatch  为何鼓掌面子有
手有一些好漂亮 手抓帽子便碍手           6 English words

How to Improve Thinking Power      by Randa Morris 
Thinking power includes your ability to focus, reason, concentrate, and remember.
1 Exercise the mind. .
2 Take care of the body.
3  Eat brain foods. Consuming raw, dark, leafy, green vegetables such as spinach and kale on a daily basis,
4 Learn and practice memory techniques. 
5 Identify your learning style. 6.Practice meditation and relaxation techniques.
7 Deal with emotional issues. 
8. Open yourself up to new experiences.