Introduction to TOCSY NMR Spectroscopy 

3:22 onwards... A spin system is basically a set of nuclei (H atoms in the case above) that are connected to each other via sp3 (or sp2) carbons. This is because sp3 carbons possess 's' character and the electrons can therefore penetrate the nucleus. This interaction of electrons with the nucleus connects adjacent hydrogen nuclei to each other along a carbon chain. Spin systems stop at hetero atoms such as N or O or when a carbon does not contain hydrogens. Therefore the spin system is just that part where you have CH-CH connectivity. Which for amino acids is the alkyl moiety.

So if I had something like -C=C- with TOCSY, the spin system will not be interrupted? And what about triple bonds between C?