I'm at the end of volume 3, and i just wondered does Rudeus start sword training again at some point? I don't need specifics just a yes or no.

Yes, but its not what you expect. Click on the spoilers below if you want specifics.

He(Rudi) tries to practice, he trains his body by doing push ups, sit ups, running and he eventually attains a nice hard body but alas, he cannot advance in any of the styles(Sword god,Water god, or North) Because he has no talent in fighting spirit.

Fighting Spirit is

It's magic power that a person (usually a swordsmen/woman) inject into their bodies to make it physically stronger ie body reinforcement. But Rudi can't do that so the way of the swordsmen is out of the picture.

fear death,fear pain,fear suffering what i fear is Nostalgia.

my past memories never ceases to let go.