"Only those with a higher ideal will find karate interesting enough to perserve in the rigors it entails. Those who do will find that the harder they train the more fascinating the art becomes." (Funakoshi Gichin)
Zao No Mei -- kyokushin code
Take a look at the Father of kyokushin karate, Mas Oyama (pic1, pic2). And here is the chief of our organization nowdays, Matsui (pic1, pic2, pic3). Some ways to practice: pic1, pic2.
"Following the Martial Way is like scaling a cliff -- continue upwards without rest."