san1 vs tai2 vs san1 tai2 I am doing martial arts and met some Cantonese people.

In "Punch me to the body!" what word would I use for body? san1 (身), tai2 (體) or both? I found them all in the dictionary and I'm not sure which to use when. They speak very little English, so I thought I'd ask here. Also it would be nice to know how to say "Punch me to the body" or "punch me to the face" or "punch me here".
Well, martial arts and Cantonese, you like Bruce Lee? Anyway, here's what you want:

打我心口 - punch (打) my (我) chest (心口)

打我個肚 - punch (打) my (我) abdomen (肚)

打我個頭 -  punch (打) my (我) head (頭)

打我呢度 -  punch (打) my (我) here (呢度) [supposed you pointed to somewhere by your finger, when you say it] 

Sound files:

打　⋯　http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/daa2.Mp3

我　⋯　http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/ngo5.Mp3

心口　⋯　http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/sam1.Mp3 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/hau2.Mp3

個肚　⋯　http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/go3.Mp3http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/tou5.Mp3

個頭　⋯　http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/go3.Mp3http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/tau4.Mp3

呢度　⋯　http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/nei1.Mp3http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/sound/dou6.Mp3

Furthermore, 打 (punch) is assumed using fists. If you need other types of attacks (fingers, palm, elbow, or kick), you need to state clearly to you companions :)

BTW, just curious, which martial arts are you learning?