5 levels before traniers level of skill?

ie - master trainer is 90, so use them at 85?

You can train 5 levels of any skill every single level,

e.g. I trained 5 levels of Heavy Armor with Farkas at Lv51, then 5 levels again at 52, then again at 53.... but this meant I couldn't train my two-handed with Vilkas at all during these levels.

So it's never too early to start training if you have the gold.

thank you
here i thought you only had the chance to train 5 times with a single trainer.

I tend to train my secondary skill. My logic is that my primary skills will raise faster naturally on its on. I have trained a couple non-prime skills a couple points to quicken the advance for a wanted perk.